[lib] update community reducer to handle new community action types

Summary:
Earlier in this stack we introduced three new community actions: fetchCommunityInfosActionTypes, createOrUpdateFarcasterChannelTagActionTypes and deleteFarcasterChannelTagActionTypes.

As part of introducing redux actions, we also need to introduce the redux reducer logic for each action type.

Depends on D12025

Test Plan: Tested each action individually, and confirmed using the redux dev tools that I was getting the correct payload + updated state

Reviewers: tomek, kamil

Reviewed By: tomek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12027