Added support for setting the current animation frame (#3681)

esphome/components/display/display_buffer.h

@@ -491,6 +491,12 @@ class Animation : public Image {
   void next_frame();
   void prev_frame();
 
+  /** Selects a specific frame within the animation.
+   *
+   * @param frame If possitive, advance to the frame. If negative, recede to that frame from the end frame.
+   */
+  void set_frame(int frame);
+
  protected:
   int current_frame_;
   int animation_frame_count_;