Move esp32_ble_server to its own component (#1898)

esphome/components/esp32_ble_server/ble_2902.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "ble_descriptor.h"
+
+#ifdef ARDUINO_ARCH_ESP32
+
+namespace esphome {
+namespace esp32_ble_server {
+
+class BLE2902 : public BLEDescriptor {
+ public:
+  BLE2902();
+};
+
+}  // namespace esp32_ble_server
+}  // namespace esphome
+
+#endif