[web-db] choose storage engine depending on whether database is supported or not

Summary:
Conditionally use default persist storage API or database depending on whether database is supported or not.

Depends on D7666

Test Plan: Switch to commReduxStorageEngine and test if it works for not supported database

Reviewers: tomek, michal

Reviewed By: tomek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7667