[lib] extend message store ops to handle processing local field ops

Summary:
introduce necessary types + extend message store ops to handle processing local field using ops approach

Depends on D12214

Test Plan: flow + tested the entire stack at the end of the hackathon

Reviewers: tomek, kamil, will

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12215