[lib] Add handler component for retrying holder processing

Summary:
Address ENG-9290.
Added handler component that watches for NOT_ESTABLISHED and NOT_REMOVED holders and retries their processing.

Test Plan:

• Started a DM thread and set image avatar.
• Changed client Blob Service URL to a fake one.
• Reset the avatar back to emoji. This caused holder removal that failed.
• Used console logs in the handler to see that it retries every 5s.
• After restoring real Blob URL, it successfully removed that holder.

Reviewers: tomek, kamil, inka

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13653