Depends on D5115
AddMembersList component could be reused in another modals (i.a. in next diff - ComposeSubchannelModal)
Main changes:
a) split AddMembersList to 2 components:
- AddMembersListContent- contains logic responsible directly for data processing for Members modal
- AddMembersList - generate list
b) create directory for common modal components (web/modals/components)
c) move all associated with current AddMembersList components to web/modals/components