Create GT911 Touchscreen component (#4027)

Co-authored-by: clydebarrow <2366188+clydebarrow@users.noreply.github.com>

esphome/components/touchscreen/touchscreen.cpp

@@ -18,6 +18,11 @@ void Touchscreen::set_display(display::Display *display) {
   }
 }
 
+void Touchscreen::send_release_() {
+  for (auto *listener : this->touch_listeners_)
+    listener->release();
+}
+
 void Touchscreen::send_touch_(TouchPoint tp) {
   ESP_LOGV(TAG, "Touch (x=%d, y=%d)", tp.x, tp.y);
   this->touch_trigger_.trigger(tp);

esphome/components/touchscreen/touchscreen.h

@@ -41,6 +41,7 @@ class Touchscreen {
  protected:
   /// Call this function to send touch points to the `on_touch` listener and the binary_sensors.
   void send_touch_(TouchPoint tp);
+  void send_release_();
 
   uint16_t display_width_;
   uint16_t display_height_;