[native] Introduce CommIcon component
Summary:
Create a separate CommIcon pack that includes custom icons that aren't in the SWMansion icon pack.
Here are the included icons:
Test Plan: Will be tested in subsequent diffs that "consume" the CommIcon component.
Reviewers: abosh, jacek, tomek, varun
Reviewed By: abosh, varun
Subscribers: ashoat, adrian
Differential Revision: https://phab.comm.dev/D4829