[web] introduce RoleGroupMemberList

Summary:
This diff introduces the RoleGroupMemberList component. This component handles the logic of sorting + ENS resolving the list of members + will be consumed by the member list sidebar (will be introduced in the next diff)

Linear task: https://linear.app/comm/issue/ENG-5975/introduce-new-member-list-section

Depends on D10919

Test Plan:
Please see the screenshot below where the members are sorted in alphabetical order + ens resolved

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10921