This diff introduces the action sheet "dropdown component" for selecting a farcaster channel that the user follows and wants to tag to their Comm community.
Please note that the UI for this screen is still a WIP and subsequent diffs will introduce the rest of the elements needed on this screen (ie the submit button)
Linear task: https://linear.app/comm/issue/ENG-7546/introduce-a-farcaster-dropdown-component + https://linear.app/comm/issue/ENG-7545/fetch-all-the-farcaster-channels-the-community-creatoradmin-is-active
Depends on D11682