[CommCoreModule] Introduce CommCoreModule::setNotifyToken

Summary: Stores notifyToken value in the SQLite metadata table

Test Plan:

1. Call the function
2. Verify that the row was created in the SQLite DB

https://blob.sh/atul/50fb.png

Reviewers: palys-swm, def-au1t, karol-bisztyga, varun, ashoat, jimpo

Reviewed By: palys-swm, ashoat

Subscribers: Adrian, benschac

Differential Revision: https://phabricator.ashoat.com/D3171