chore: firebase ability to use Realtime Database

[faustman]

Hi! First time here,

The problem:

No access to Realtime Database API from the Firebase Admin SDK in the NestJS App.

The solution:

• Added database attribute to FirebaseAdmin interface
• Adjust createInstances function to fulfill new interface

Notes:

• previously there is a db attribute that provides access to firestore (which is confused me..)
• seems that there is confusion with db and database attributes now
• I guess to have API more consistent, probably better to rename db -> firestore. But it leads to breaking changes Like:

firestore: firebaseAdmin.firestore.Firestore;

WDYT?

[9renpoto]

thank you pr :) plz review CI results

I guess to have API more consistent, probably better to rename db -> firestore

Good idea, since it is a BREAKING CHANGE, I will do it when I release version 9

[shahkeyur]

@9renpoto Any update on this ?

[9renpoto]

We are preparing for the release of v9 here. We would be happy to have you test through this PR, but if it seems difficult, we will consider cherry-pick.

[shahkeyur]

Thanks for the update. I can see if I could run some test and let you know.