[web] introduce block list panel

Summary:
This diff introduces the block list panel. This component will replace the block list modal.

Linear task: https://linear.app/comm/issue/ENG-5955/flatten-friends-block-list-modals

Test Plan:
Please see the demo video below

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10712