Connect to File Transfer Client in Unity

Changelog

Added FirebaseFirestore and FirebaseStorage unity packages (version 8.8.0) as dependencies
Updated Android build identifier to match Firebase configuration
Implemented API for interacting with File Management Firebase backend:
- A function to add text entry (for OCRed text)
- Callback for responding to database updates (for dashboard), with a sample implementation that just logs changes
- A function for getting download handle (so each file type can choose how to download)

[ ] You might see "Failed to update Android SDK package list. See the Console for details" when trying to compile due to Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema. This seems to be a bug with Unity and can be fixed by following this stack overflow solution.
[x] Unity complained about duplicate dependencies. Solved using pickFirst mentioned in https://github.com/wonday/react-native-pdf/issues/432. However, this might indicate underlying issues with how dependencies are imported.

This is again a gigantic PR 😢 but most files are just dependency binaries 🤔. You can focus on:

Main
- Boardless/Assets/Scripts/FirebaseServices.cs: code for interacting with Firestore database and file Storage
- Boardless/Assets/Scenes/FirebaseServicesTest.unity: a basic scene for quickly testing FirebaseServices
Configs
- Boardless/Assets/Plugins/Android/launcherTemplate.gradle: workarounds for known issues
- Boardless/Assets/Plugins/Android/gradleTemplate.properties: Android Resolver Properties wants to have this file once I added the above grade config, not sure why but okay
- Boardless/ProjectSettings/ProjectSettings.asset: Android bundle identifier.
Resources
- Boardless/Assets/google-services.json: Firebase constants
- Boardless/Assets/Plugins/Android/Firebase.androidlib/res/values/google-services.xml
  Generated using Assets/Firebase/Editor/generate_xml_from_google_services_json.py -i Assets/google-services.json -o Assets/Plugins/Android/Firebase.androidlib/res/values/google-services.xml

No print debugging, don't know what exactly is going wrong. Had to read the source code of our open source dependencies--insightful but time-consuming.
Confused by an outdated issue saying Firebase Unity SDK doesn't work on devices not having Google Play Services https://github.com/firebase/quickstart-unity/issues/223, despite decoupling is already completed for the ones we need. Spent time trying out other 3rd party libraries without success.
macOS Monterey no longer ships with Python 2 and causes the Firebase plugin to not generate the necessary configuration files, as tracked in https://github.com/firebase/firebase-unity-sdk/issues/154. Fixed by manually converting and configuring the missing XML file using https://github.com/firebase/quickstart-unity/issues/677 to the desired location documented in https://firebase.google.com/docs/unity/troubleshooting-faq