☂️ add firebase storage support for Linux and Windows

[lesnitsky]

This is an umbrella issue for firebase_storage implementation in flutterfire_desktop

Development branch: feat/storage

Todos:

Firebase Storage Dart

Pure dart implementation of firebase_storage APIs

• [x] list()
• [x] listAll()
• [x] getData()
• [x] getMetadata()
• [x] updateMetadata(SettableMetadata metadata)
• [x] putData(Uint8List data)
• [x] putFile(File file)
  • [x] single multipart request upload for small files
  • [x] resumable chunked uploads for large files
• [x] putString(String string)
• [x] writeToFile(File file)
  • [x] resumable downloads
• [x] interop with Firebase Auth
• [x] download/upload operations retry mechanism

Windows and Linux federated plugins

• [x] federated plugin for macOS (for development purposes)
• [x] federated plugin for Linux
• [x] federated plugin for Windows
• [x] example app
• [x] e2e tests