Introduce a simple abstraction over `Command`

[bartekpacia]

Currently patrol_cli has basically one main command, drive. It's class, DriveCommand, is too big, and I think it could benefit from the following abstraction:

/// Command which first prepares its config before executing.
abstract class StagedCommand<T> extends Command<int> {
  void createOptions(ArgParser argParser);

  Future<T> prepare();

  Future<int> execute(T config);

  @override
  @nonVirtual
  Future<int> run() async {
    createOptions(argParser);
    final config = await prepare();
    return execute(config);
  }
}

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