[web-db] add migration logic to SQLite on web

Summary:
Similar to keyserver logic. Currently, nothing is happening when migration will fail but there is a followup task to improve error handling on web.

Depends on D7939

Test Plan:

1. Check if migrate is called when using old db
2. Check in migrate is not called when creating fresh database
3. Tests

Reviewers: tomek, michal

Reviewed By: michal

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7982