[lib] Add action type for processing holders

Summary:
Added action types and updated reducer for the "process holders" action.

• Holders are marked as PENDING_ESTABLISHMENT or PENDING_REMOVAL, before making Blob calls
• Afterwards they're either removed or marked as ESTABLISHED.
• In case of failure, all of them are marked as NOT_ESTABLISHED / NOT_REMOVED. This will be then handled by a handler component (introduced later) for retrying.

Depends on D13403

Test Plan:

• Reducer unit tests
• Tested together with actual Blob calls

Reviewers: kamil, tomek

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13408