[native] Create a single base class for all the ops
Summary:
All the base classes were providing the same functions. Also, it is convenient to be able to store all the ops in a single array - in order to process them in a single transaction.
https://linear.app/comm/issue/ENG-6004/wrap-all-store-operations-from-one-action-in-transaction
Test Plan: Opened the app, modified a draft, closed and reopened the app - the draft was correct.
Reviewers: kamil, marcin, varun
Reviewed By: kamil
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D11902