[FR]

**Is your feature request related to a problem? Please describe.**
To be able to use Firebase emulator and Firebase storage. I need to be able to override host.

**Describe the solution you'd like**
Allow us to pass StorageOption to FirebaseOption

**Describe alternatives you've considered**
To move from Google to AWS.

Start by tracing the FirebaseOption and StorageOption APIs to understand how storage configuration is currently passed. Done means callers can provide a StorageOption through FirebaseOption and override the storage host for the Firebase emulator; add or update the relevant tests if the existing test structure identifies them.

Written by the indexing model from the issue text.