[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