[lib] DMOperationSpec for change thread settings operation

Summary:
Create the spec.

https://linear.app/comm/issue/ENG-8737/create-dmoperations-for-changesettingsmessageinfo

Depends on D12872

Test Plan: Tested that processing the operation with changed name and color results with these values being updated both in Redux and in the DB (on web).

Reviewers: kamil, inka

Reviewed By: inka

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D12881