Add PEP-484 type annotations to zerver/worker/.
Add PEP-484 type annotations to zerver/worker/.

punchagan/zulip,amanharitsh123/zulip,dhcrzf/zulip,Galexrt/zulip,paxapy/zulip,jainayush975/zulip,SmartPeople/zulip,dattatreya303/zulip,calvinleenyc/zulip,kou/zulip,shubhamdhama/zulip,ryanbackman/zulip,souravbadami/zulip,mahim97/zulip,AZtheAsian/zulip,zacps/zulip,vabs22/zulip,andersk/zulip,Diptanshu8/zulip,dawran6/zulip,KingxBanana/zulip,samatdav/zulip,christi3k/zulip,umkay/zulip,vikas-parashar/zulip,ahmadassaf/zulip,souravbadami/zulip,showell/zulip,SmartPeople/zulip,rishig/zulip,blaze225/zulip,ryansnowboarder/zulip,krtkmj/zulip,Frouk/zulip,vaidap/zulip,sonali0901/zulip,amyliu345/zulip,cosmicAsymmetry/zulip,ryanbackman/zulip,blaze225/zulip,eeshangarg/zulip,krtkmj/zulip,peguin40/zulip,paxapy/zulip,j831/zulip,eeshangarg/zulip,sharmaeklavya2/zulip,dattatreya303/zulip,jainayush975/zulip,JPJPJPOPOP/zulip,timabbott/zulip,timabbott/zulip,Vallher/zulip,jainayush975/zulip,kou/zulip,PhilSk/zulip,andersk/zulip,vaidap/zulip,dawran6/zulip,punchagan/zulip,niftynei/zulip,calvinleenyc/zulip,samatdav/zulip,TigorC/zulip,jackrzhang/zulip,dwrpayne/zulip,kou/zulip,timabbott/zulip,SmartPeople/zulip,rht/zulip,blaze225/zulip,jrowan/zulip,tommyip/zulip,dawran6/zulip,paxapy/zulip,sup95/zulip,isht3/zulip,reyha/zulip,dwrpayne/zulip,brockwhittaker/zulip,krtkmj/zulip,krtkmj/zulip,cosmicAsymmetry/zulip,sharmaeklavya2/zulip,reyha/zulip,isht3/zulip,peiwei/zulip,SmartPeople/zulip,isht3/zulip,shubhamdhama/zulip,tommyip/zulip,showell/zulip,joyhchen/zulip,ahmadassaf/zulip,sup95/zulip,Jianchun1/zulip,TigorC/zulip,JPJPJPOPOP/zulip,rht/zulip,brainwane/zulip,jphilipsen05/zulip,reyha/zulip,tommyip/zulip,andersk/zulip,ahmadassaf/zulip,shubhamdhama/zulip,Vallher/zulip,jainayush975/zulip,grave-w-grave/zulip,rht/zulip,ryanbackman/zulip,grave-w-grave/zulip,dwrpayne/zulip,ryansnowboarder/zulip,krtkmj/zulip,amyliu345/zulip,brainwane/zulip,sonali0901/zulip,amanharitsh123/zulip,sup95/zulip,KingxBanana/zulip,susansls/zulip,grave-w-grave/zulip,sharmaeklavya2/zulip,sonali0901/zulip,JPJPJPOPOP/zulip,aakash-cr7/zulip,arpith/zulip,hackerkid/zulip,sharmaeklavya2/zulip,umkay/zulip,hackerkid/zulip,brainwane/zulip,dawran6/zulip,zacps/zulip,verma-varsha/zulip,dawran6/zulip,vabs22/zulip,jphilipsen05/zulip,mahim97/zulip,amanharitsh123/zulip,Jianchun1/zulip,dwrpayne/zulip,dattatreya303/zulip,rht/zulip,amyliu345/zulip,amyliu345/zulip,brockwhittaker/zulip,susansls/zulip,aakash-cr7/zulip,showell/zulip,tommyip/zulip,SmartPeople/zulip,mohsenSy/zulip,KingxBanana/zulip,rishig/zulip,grave-w-grave/zulip,christi3k/zulip,vikas-parashar/zulip,peguin40/zulip,eeshangarg/zulip,jrowan/zulip,sonali0901/zulip,verma-varsha/zulip,synicalsyntax/zulip,andersk/zulip,kou/zulip,sharmaeklavya2/zulip,samatdav/zulip,Frouk/zulip,cosmicAsymmetry/zulip,eeshangarg/zulip,vaidap/zulip,dattatreya303/zulip,umkay/zulip,susansls/zulip,JPJPJPOPOP/zulip,eeshangarg/zulip,reyha/zulip,KingxBanana/zulip,niftynei/zulip,verma-varsha/zulip,mohsenSy/zulip,dattatreya303/zulip,peiwei/zulip,synicalsyntax/zulip,joyhchen/zulip,krtkmj/zulip,peiwei/zulip,zulip/zulip,Galexrt/zulip,niftynei/zulip,Galexrt/zulip,souravbadami/zulip,rht/zulip,tommyip/zulip,vaidap/zulip,verma-varsha/zulip,hackerkid/zulip,paxapy/zulip,Frouk/zulip,verma-varsha/zulip,zulip/zulip,showell/zulip,rht/zulip,brockwhittaker/zulip,punchagan/zulip,jackrzhang/zulip,vabs22/zulip,jrowan/zulip,timabbott/zulip,vabs22/zulip,christi3k/zulip,hackerkid/zulip,jackrzhang/zulip,arpith/zulip,amyliu345/zulip,Juanvulcano/zulip,aakash-cr7/zulip,jrowan/zulip,jphilipsen05/zulip,Jianchun1/zulip,umkay/zulip,rishig/zulip,jrowan/zulip,rht/zulip,PhilSk/zulip,vikas-parashar/zulip,mahim97/zulip,shubhamdhama/zulip,paxapy/zulip,synicalsyntax/zulip,umkay/zulip,j831/zulip,samatdav/zulip,zacps/zulip,Diptanshu8/zulip,christi3k/zulip,arpith/zulip,mahim97/zulip,dattatreya303/zulip,punchagan/zulip,dhcrzf/zulip,blaze225/zulip,Galexrt/zulip,isht3/zulip,dhcrzf/zulip,susansls/zulip,synicalsyntax/zulip,jainayush975/zulip,Vallher/zulip,brockwhittaker/zulip,punchagan/zulip,synicalsyntax/zulip,brainwane/zulip,Diptanshu8/zulip,arpith/zulip,timabbott/zulip,Vallher/zulip,PhilSk/zulip,Juanvulcano/zulip,peguin40/zulip,paxapy/zulip,ryanbackman/zulip,jrowan/zulip,rishig/zulip,Frouk/zulip,dwrpayne/zulip,isht3/zulip,vabs22/zulip,Frouk/zulip,JPJPJPOPOP/zulip,showell/zulip,isht3/zulip,mohsenSy/zulip,ryansnowboarder/zulip,AZtheAsian/zulip,timabbott/zulip,krtkmj/zulip,arpith/zulip,TigorC/zulip,joyhchen/zulip,jphilipsen05/zulip,hackerkid/zulip,Galexrt/zulip,Diptanshu8/zulip,samatdav/zulip,brainwane/zulip,amanharitsh123/zulip,ahmadassaf/zulip,kou/zulip,synicalsyntax/zulip,peguin40/zulip,mohsenSy/zulip,dhcrzf/zulip,jainayush975/zulip,calvinleenyc/zulip,christi3k/zulip,souravbadami/zulip,Vallher/zulip,rishig/zulip,jackrzhang/zulip,tommyip/zulip,ryansnowboarder/zulip,zulip/zulip,eeshangarg/zulip,dawran6/zulip,Juanvulcano/zulip,cosmicAsymmetry/zulip,andersk/zulip,TigorC/zulip,amanharitsh123/zulip,peiwei/zulip,TigorC/zulip,niftynei/zulip,Frouk/zulip,peiwei/zulip,PhilSk/zulip,Galexrt/zulip,JPJPJPOPOP/zulip,mahim97/zulip,Vallher/zulip,KingxBanana/zulip,blaze225/zulip,brockwhittaker/zulip,calvinleenyc/zulip,j831/zulip,synicalsyntax/zulip,Juanvulcano/zulip,eeshangarg/zulip,ahmadassaf/zulip,jphilipsen05/zulip,dwrpayne/zulip,showell/zulip,AZtheAsian/zulip,aakash-cr7/zulip,zulip/zulip,j831/zulip,dhcrzf/zulip,calvinleenyc/zulip,peiwei/zulip,brockwhittaker/zulip,arpith/zulip,zulip/zulip,showell/zulip,mohsenSy/zulip,susansls/zulip,aakash-cr7/zulip,jackrzhang/zulip,amyliu345/zulip,PhilSk/zulip,Jianchun1/zulip,dwrpayne/zulip,grave-w-grave/zulip,vikas-parashar/zulip,Jianchun1/zulip,joyhchen/zulip,ryanbackman/zulip,reyha/zulip,shubhamdhama/zulip,ahmadassaf/zulip,vabs22/zulip,zulip/zulip,hackerkid/zulip,AZtheAsian/zulip,amanharitsh123/zulip,timabbott/zulip,kou/zulip,j831/zulip,souravbadami/zulip,ryanbackman/zulip,calvinleenyc/zulip,peguin40/zulip,niftynei/zulip,kou/zulip,niftynei/zulip,sonali0901/zulip,Diptanshu8/zulip,andersk/zulip,dhcrzf/zulip,vaidap/zulip,Frouk/zulip,joyhchen/zulip,umkay/zulip,christi3k/zulip,Diptanshu8/zulip,Galexrt/zulip,punchagan/zulip,jackrzhang/zulip,AZtheAsian/zulip,souravbadami/zulip,zulip/zulip,TigorC/zulip,rishig/zulip,joyhchen/zulip,cosmicAsymmetry/zulip,Juanvulcano/zulip,grave-w-grave/zulip,dhcrzf/zulip,Vallher/zulip,ryansnowboarder/zulip,zacps/zulip,andersk/zulip,hackerkid/zulip,vikas-parashar/zulip,zacps/zulip,PhilSk/zulip,susansls/zulip,zacps/zulip,cosmicAsymmetry/zulip,j831/zulip,jackrzhang/zulip,peiwei/zulip,Juanvulcano/zulip,verma-varsha/zulip,sup95/zulip,ahmadassaf/zulip,AZtheAsian/zulip,blaze225/zulip,SmartPeople/zulip,reyha/zulip,aakash-cr7/zulip,sonali0901/zulip,sharmaeklavya2/zulip,shubhamdhama/zulip,shubhamdhama/zulip,punchagan/zulip,KingxBanana/zulip,mohsenSy/zulip,vaidap/zulip,samatdav/zulip,ryansnowboarder/zulip,brainwane/zulip,mahim97/zulip,rishig/zulip,ryansnowboarder/zulip,umkay/zulip,peguin40/zulip,sup95/zulip,brainwane/zulip,sup95/zulip,jphilipsen05/zulip,vikas-parashar/zulip,tommyip/zulip,Jianchun1/zulip