Version 11.0.0

### 11.0.0
- Changes
    - App Check: Adds support for Firebase App Check on Android, iOS, tvOS,
      and desktop platforms. To learn more, see
      https://firebase.google.com/docs/app-check
    - Messaging: Remove deprecated calls `Send`, `Subscribe`, and `Unsubscribe`.
    - Remote Config (Android/iOS): Added support for real-time config updates. Use the new
      `OnConfigUpdateListener` API to get real-time updates. Existing
      `FetchAsync` and `ActivateAsync` APIs aren't affected by this change.
      To learn more, see
      [Get started with Firebase Remote Config](https://firebase.google.com/docs/remote-config/get-started?platform=unity#add-real-time-listener).
    - Auth: Deprecated a number of methods, appending `_DEPRECATED` to some of
      their names. This is a breaking change; you must either modify your code
      to refer to the `_DEPRECATED` methods, or switch to the new methods, which
      have new return types `AuthResult` (rather than `SignInResult`). The
      deprecated methods will be removed in the *next* major release of the
      Firebase Unity SDK. *(Note: do not mix and match using the old
      and new methods or undefined behavior may result.)*