[web-db] add indexedDB config

Summary:
Adding config according to docs.

Depends on D6986, D6989, D6988

Test Plan:
Run this code:

try {
  const value = await localforage.setItem('test', {
    prop: 'test prop',
  });
  console.log(value);
} catch (err) {
  console.log(err);
}

and check in devtools (web and desktop) if database was properly created

Reviewers: michal, tomek

Reviewed By: tomek

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D6990