[firebase_crashlytics] - Automatically symbolize obfuscated stack trace in Firebase Console

[shorben07]

Firebase provides support for deobfuscating crash reports for native iOS/Android code https://firebase.google.com/docs/crashlytics/get-deobfuscated-reports?platform=ios&authuser=1

It would be really convenient for developers to have ability to automatically deobfuscate dart code exceptions recorded by plugin method
FirebaseCrashlytics.instance.recordError(error, stackTrace);