Log | additions

[a-givertzman]

• add named constructor with custom level

Log.withLevel(
   String name,
   LogLevel level,
)

• add optional parameter "method" in the Log.debug / info / warning / error to have following result in log:

flutter: [LoggerName.method] message

• add method:

  /// Log message at level [Level.CONFIG].
  ///
  /// See [log] for information on how non-String [message] arguments are
  /// handled.
  void config(Object? message, [Object? error, StackTrace? stackTrace]) =>
    Logger(_name).log(LogLevel.config, message, error, stackTrace);