linter: Add rule against multiple whitespaces after comma.
linter: Add rule against multiple whitespaces after comma.

tommyip/zulip,rht/zulip,rht/zulip,timabbott/zulip,punchagan/zulip,timabbott/zulip,tommyip/zulip,shubhamdhama/zulip,brockwhittaker/zulip,showell/zulip,hackerkid/zulip,timabbott/zulip,mahim97/zulip,tommyip/zulip,dhcrzf/zulip,tommyip/zulip,brainwane/zulip,synicalsyntax/zulip,tommyip/zulip,eeshangarg/zulip,dhcrzf/zulip,hackerkid/zulip,rishig/zulip,jackrzhang/zulip,rht/zulip,zulip/zulip,dhcrzf/zulip,hackerkid/zulip,andersk/zulip,synicalsyntax/zulip,hackerkid/zulip,dhcrzf/zulip,eeshangarg/zulip,timabbott/zulip,jackrzhang/zulip,showell/zulip,kou/zulip,eeshangarg/zulip,punchagan/zulip,dhcrzf/zulip,tommyip/zulip,synicalsyntax/zulip,synicalsyntax/zulip,shubhamdhama/zulip,eeshangarg/zulip,mahim97/zulip,rishig/zulip,jackrzhang/zulip,brainwane/zulip,hackerkid/zulip,rht/zulip,zulip/zulip,mahim97/zulip,andersk/zulip,andersk/zulip,brockwhittaker/zulip,Galexrt/zulip,zulip/zulip,dhcrzf/zulip,jackrzhang/zulip,tommyip/zulip,jackrzhang/zulip,Galexrt/zulip,zulip/zulip,rht/zulip,brockwhittaker/zulip,shubhamdhama/zulip,rishig/zulip,synicalsyntax/zulip,shubhamdhama/zulip,synicalsyntax/zulip,brainwane/zulip,showell/zulip,shubhamdhama/zulip,timabbott/zulip,kou/zulip,andersk/zulip,punchagan/zulip,andersk/zulip,kou/zulip,brockwhittaker/zulip,eeshangarg/zulip,eeshangarg/zulip,shubhamdhama/zulip,hackerkid/zulip,showell/zulip,Galexrt/zulip,brockwhittaker/zulip,brockwhittaker/zulip,showell/zulip,showell/zulip,punchagan/zulip,hackerkid/zulip,brainwane/zulip,rht/zulip,dhcrzf/zulip,brainwane/zulip,Galexrt/zulip,rishig/zulip,rht/zulip,kou/zulip,brainwane/zulip,zulip/zulip,timabbott/zulip,kou/zulip,punchagan/zulip,synicalsyntax/zulip,kou/zulip,Galexrt/zulip,andersk/zulip,shubhamdhama/zulip,mahim97/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,jackrzhang/zulip,jackrzhang/zulip,mahim97/zulip,mahim97/zulip,brainwane/zulip,zulip/zulip,zulip/zulip,andersk/zulip,Galexrt/zulip,timabbott/zulip,Galexrt/zulip,rishig/zulip,showell/zulip,rishig/zulip,rishig/zulip,eeshangarg/zulip