message: Implement `go` motion
  This, like `:goto`, puts the cursor on the Position at offset `[count]`
diff: @@ -1480,6 +1480,17 @@ class MovePreviousSentenceBegin extends BaseMovement {
  }
  }
  +@RegisterAction
  +class GoToOffset extends BaseMovement {
  + keys = ['g', 'o'];
  + isJump = true;
  +
  + public async execActionWithCount(position: Position, vimState: VimState, count: number) {
  + vimState.currentRegisterMode = RegisterMode.LineWise;
  + return vimState.document.positionAt((count || 1) - 1);
  + }
  +}
  +
  @RegisterAction
  class MoveNextSentenceBegin extends BaseMovement {
  keys = [')'];
  