CachingBuildEngine: Create a new Scope object for buildLocally
CachingBuildEngine: Create a new Scope object for buildLocally

Summary:
I'm working towards allowing individual build rules to create their own `ListenableFuture`
when they need to be built locally. In subsequent commits, we'll pass a `Supplier` of this scope in to
`BuildRule`, so that `BuildRule`s can create the scope when they
need it.

Unlike the previous commits in this stack, this one was entirely
done by hand.

Test Plan: CI

fbshipit-source-id: b14368a

rmaz/buck,marcinkwiatkowski/buck,romanoid/buck,zpao/buck,kageiit/buck,marcinkwiatkowski/buck,brettwooldridge/buck,k21/buck,facebook/buck,LegNeato/buck,Addepar/buck,shybovycha/buck,clonetwin26/buck,kageiit/buck,dsyang/buck,Addepar/buck,LegNeato/buck,robbertvanginkel/buck,ilya-klyuchnikov/buck,LegNeato/buck,clonetwin26/buck,k21/buck,marcinkwiatkowski/buck,romanoid/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,rmaz/buck,brettwooldridge/buck,k21/buck,LegNeato/buck,shs96c/buck,ilya-klyuchnikov/buck,robbertvanginkel/buck,LegNeato/buck,zhan-xiong/buck,LegNeato/buck,JoelMarcey/buck,zpao/buck,SeleniumHQ/buck,JoelMarcey/buck,rmaz/buck,zpao/buck,ilya-klyuchnikov/buck,shs96c/buck,facebook/buck,k21/buck,robbertvanginkel/buck,ilya-klyuchnikov/buck,JoelMarcey/buck,k21/buck,robbertvanginkel/buck,kageiit/buck,JoelMarcey/buck,dsyang/buck,clonetwin26/buck,LegNeato/buck,shybovycha/buck,rmaz/buck,shs96c/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,robbertvanginkel/buck,zhan-xiong/buck,dsyang/buck,kageiit/buck,Addepar/buck,romanoid/buck,dsyang/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,k21/buck,dsyang/buck,shs96c/buck,Addepar/buck,Addepar/buck,rmaz/buck,SeleniumHQ/buck,rmaz/buck,dsyang/buck,romanoid/buck,zpao/buck,SeleniumHQ/buck,LegNeato/buck,rmaz/buck,k21/buck,shs96c/buck,clonetwin26/buck,shybovycha/buck,nguyentruongtho/buck,shybovycha/buck,kageiit/buck,romanoid/buck,shs96c/buck,zhan-xiong/buck,marcinkwiatkowski/buck,zpao/buck,shs96c/buck,romanoid/buck,Addepar/buck,romanoid/buck,rmaz/buck,shybovycha/buck,SeleniumHQ/buck,zhan-xiong/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,nguyentruongtho/buck,nguyentruongtho/buck,JoelMarcey/buck,JoelMarcey/buck,LegNeato/buck,facebook/buck,facebook/buck,marcinkwiatkowski/buck,brettwooldridge/buck,brettwooldridge/buck,rmaz/buck,clonetwin26/buck,shybovycha/buck,zhan-xiong/buck,zhan-xiong/buck,ilya-klyuchnikov/buck,Addepar/buck,dsyang/buck,nguyentruongtho/buck,JoelMarcey/buck,romanoid/buck,romanoid/buck,rmaz/buck,marcinkwiatkowski/buck,brettwooldridge/buck,clonetwin26/buck,marcinkwiatkowski/buck,shybovycha/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,shs96c/buck,SeleniumHQ/buck,clonetwin26/buck,kageiit/buck,dsyang/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,clonetwin26/buck,k21/buck,Addepar/buck,dsyang/buck,shs96c/buck,zhan-xiong/buck,shybovycha/buck,nguyentruongtho/buck,dsyang/buck,shybovycha/buck,robbertvanginkel/buck,romanoid/buck,Addepar/buck,LegNeato/buck,robbertvanginkel/buck,shybovycha/buck,SeleniumHQ/buck,shs96c/buck,facebook/buck,zhan-xiong/buck,SeleniumHQ/buck,brettwooldridge/buck,k21/buck,JoelMarcey/buck,dsyang/buck,shs96c/buck,clonetwin26/buck,zpao/buck,JoelMarcey/buck,k21/buck,ilya-klyuchnikov/buck,k21/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,LegNeato/buck,JoelMarcey/buck,LegNeato/buck,romanoid/buck,zhan-xiong/buck,marcinkwiatkowski/buck,brettwooldridge/buck,rmaz/buck,Addepar/buck,LegNeato/buck,JoelMarcey/buck,brettwooldridge/buck,SeleniumHQ/buck,ilya-klyuchnikov/buck,kageiit/buck,zhan-xiong/buck,rmaz/buck,robbertvanginkel/buck,facebook/buck,robbertvanginkel/buck,SeleniumHQ/buck,marcinkwiatkowski/buck,zhan-xiong/buck,nguyentruongtho/buck,marcinkwiatkowski/buck,SeleniumHQ/buck,romanoid/buck,zhan-xiong/buck,robbertvanginkel/buck,ilya-klyuchnikov/buck,clonetwin26/buck,Addepar/buck,Addepar/buck,robbertvanginkel/buck,Addepar/buck,k21/buck,clonetwin26/buck,marcinkwiatkowski/buck,JoelMarcey/buck,nguyentruongtho/buck,dsyang/buck,brettwooldridge/buck,k21/buck,romanoid/buck,rmaz/buck,zpao/buck,dsyang/buck,clonetwin26/buck,JoelMarcey/buck,shs96c/buck,zhan-xiong/buck,SeleniumHQ/buck,shybovycha/buck,shs96c/buck,facebook/buck,shybovycha/buck,clonetwin26/buck,shybovycha/buck,SeleniumHQ/buck