fix the gatt client leak

android register new gatt client internally, when we call the function BluetoothDevice
.connect(Boolean autoConnect, BluetoothGattCallback callback, Handler handler).
To avoid leak, the client need to be recyled/unregisted by calling close before creating.

https://cs.android.com/android/platform/superproject/main/+/main:packages/modules/Bluetooth/framework/java/android/bluetooth/BluetoothGatt.java;drc=cfeac0c69463c7500b6fd86aa3843406f89928d3;l=1085

Author: duanju

provisioning/src/main/java/com/espressif/provisioning/transport/BLETransport.java

@@ -151,6 +151,7 @@ public void disconnect() {
 
         if (this.bluetoothGatt != null) {
             this.bluetoothGatt.disconnect();
+            this.bluetoothGatt.close();
             bluetoothGatt = null;
         }
     }