Add removeServer method to kill the server

Author: YeonwooSung

cpp_utils/BLEDevice.h

@@ -63,6 +63,7 @@ class BLEDevice {
 	static void deinit(bool release_memory = false);
 	static uint16_t		m_localMTU;
 	static esp_ble_sec_act_t 	m_securityLevel;
+	static void removeServer();
 
 private:
 	static BLEServer*	m_pServer;