[lib] add outboundP2PMessageIDs to LocalMessageInfo to track progress

Summary:
ENG-8423.

We decided to use the existing store for local messages for two reasons, to avoid adding a new store, and because in components, LocalMessageInfo is easily accessible (I think it saves us at least a couple of days of work).

Additionally LocalMessageInfo seems like a reasonable place to put this data.

All fields in LocalMessageInfo are optional, which means this does not require a migration.

Depends on D13152

Test Plan:
Make sure outboundP2PMessageIDs are persisted & read on app start.

Note: This stack is tested end-to-end according to the process described here.

Reviewers: tomek, inka

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13153