[web] introduce friend and block lists to user settings list

Summary:
In the web app redesign, the friend list and block lists modal get flattened into their own panels. As a first step, this diff introduces the friend + block lists to the user settings list + all the relevant logic needed to make this happen

Linear task: https://linear.app/comm/issue/ENG-5954/introduce-friends-list-block-list-in-the-settings-list

Depends on D10612

Test Plan:
Please see the demo video below

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10614