Create GT911 Touchscreen component (#4027)

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

esphome/components/gt911/binary_sensor/gt911_button.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "esphome/components/binary_sensor/binary_sensor.h"
+#include "esphome/components/gt911/touchscreen/gt911_touchscreen.h"
+#include "esphome/core/component.h"
+#include "esphome/core/helpers.h"
+
+namespace esphome {
+namespace gt911 {
+
+class GT911Button : public binary_sensor::BinarySensor,
+                    public Component,
+                    public GT911ButtonListener,
+                    public Parented<GT911Touchscreen> {
+ public:
+  void setup() override;
+  void dump_config() override;
+
+  void set_index(uint8_t index) { this->index_ = index; }
+
+  void update_button(uint8_t index, bool state) override;
+
+ protected:
+  uint8_t index_;
+};
+
+}  // namespace gt911
+}  // namespace esphome