Add optional databaseId to getFirestore

[felixpolimec]

It would be great to have an ability to target a specific Database in getFirestore.

GetFirestore documentation shows how one can add a databaseId ref, to allow targeting a specific database rather than just (default) database.
Documentation

~Solution
Options
getFirestore
Add the option databaseId to DataProvider firebaseOptions, and pass to getFirestore, with a default value of "" which refers to (Default) database.