[lib] action for calling fetch all communities with names endpoint
Summary:
we'll dispatch this action to call fetch_all_communities_with_names on the authoritative keyserver
Depends on D13398
Test Plan:
dispatched action using useLegacyAshoatKeyserverCall. see gist: https://gist.github.com/vdhanan/df461cabc7a954ab1bc169104b98fbbb
saw success in redux and the correct payload
Reviewers: ashoat, tomek
Reviewed By: ashoat
Differential Revision: https://phab.comm.dev/D13399