[FEATURE REQUEST] Typed variables in Firebase.gd

[4Shage]

Is your feature request related to a problem? Please describe.
I can't use autocompletion

Additional context
I hoped that some variables in Firebase.gd could be typed because I can't use godot's autocompletion.

Here is the variables I want to be typed.

`
@onready var Auth := $Auth -> @onready var Auth : FirebaseAuth = $Auth

@onready var Firestore := $Firestore -> @onready var Firestore : FirebaseFirestore = $Firestore

@onready var Database := $Database -> @onready var Database : FirebaseDatabase = $Database

@onready var Storage := $Storage -> @onready var Storage : FirebaseStorage = $Storage

@onready var DynamicLinks := $DynamicLinks -> @onready var DynamicLinks : FirebaseDynamicLinks = $DynamicLinks

@onready var Functions := $Functions -> @onready var Functions : FirebaseFunctions = $Functions

@onready var RemoteConfigAPI := $RemoteConfig -> @onready var RemoteConfigAPI : FirebaseRemoteConfig = $RemoteConfig
`