[lib] Introduce new PROCESS_DM_OPS action and dispatch from useProcessDMOperation

Summary:
Reducers will be handled in the next diff; this diff just introduces the action, and dispatches it.

Submitting this now so @tomek can see the code, as his work relates to this code.

Depends on D12741

Test Plan: Test plan described here

Reviewers: tomek, kamil, marcin

Reviewed By: tomek

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D12780