[lib, web, natvie] Add sessionID field to keyserverStore

Summary:
issue: https://linear.app/comm/issue/ENG-4457/refactor-sessionid-field
Adding sessionID to keyserverStore. Not reducing it yet.

Test Plan:
Tested that sessionID field is present in the keyseverStore. Checked that it is set to the same value as sessionID initilly.
Ran yarn flow-all.

Reviewers: michal, kamil, ashoat

Reviewed By: ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8644