[lib] Process blob holders in DM ops

Summary:
Added a hook that dispatches holder processing action as a result of DM ops.

Depends on D13407, D13409, D13410

Test Plan:
Created dummy blob op in dm-ops/change-thread-settings for creating and removing a holder.
Watched Redux Devtools and Blob HTTP traffic to confirm that holders are established and removed correctly.
Also tested with D13413 test plan

Reviewers: kamil, tomek

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13411