[lib/web/native] rename InlineSidebar to InlineEngagement
Summary:
rename InlineSidebar to InlineEngagement
Linear Task: ENG-2508
Test Plan: flow also git grep inline-sidebar git grep inlineSidebar and git grep InlineSidebar
Reviewers: atul, tomek
Reviewed By: atul
Subscribers: ashoat, tomek, atul
Differential Revision: https://phab.comm.dev/D6289