[lib] Broadcast account deletion message to peers

Summary:
Address ENG-8605.

• Created a hook to easily broadcast deletion message.

In useDeleteAccount hook, added a call to the hook before calling Identity.

Depends on D12943

Test Plan:
Tested together with D12945.
Deleted account when having device list with a secondary device and a peer in auxUserStore. Verified that both peer and my device received the ACCOUNT_DELETION message.

Reviewers: kamil

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12944