[FL-1792] RPC service (#698)

* Lib: added nanopb
* Hal rfid: fixed confused arguments
* Lib: update makefile, include nanopb
* Lib: remove nanopb
* Lib: add nanopb as submodule
* Assets: remove protobuf
* Assets: add protobuf message definitions as submodule
* WIP: [FL-1792] Add Protobuf RPC
* WIP: RPC add ping
* Add Ping
* Fix Ping, Add (WIP) storage
* Update submodule
* ble-glue: add ptotobuf to ble
* WIP: Add storage list test
* revert applications.mk
* Add Storage List command
* ble-glue: fix fast updating rx charachteristic
* ble serial: split long ble packets
* Add Storage Read/Write/Mkdir/Delete
* Disable tests
* Rename Element -> File
* Add md5sum, fix test leak
* Regenerate Protobuf
* Fix review comments
* ble-glue: sync f7 target

Co-authored-by: Albert Kharisov <albert@flipperdevices.com>
Co-authored-by: gornekich <n.gorbadey@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

.gitmodules

@@ -7,6 +7,12 @@
 [submodule "lib/littlefs"]
 	path = lib/littlefs
 	url = https://github.com/littlefs-project/littlefs.git
+[submodule "lib/nanopb"]
+	path = lib/nanopb
+	url = https://github.com/nanopb/nanopb.git
+[submodule "assets/protobuf"]
+	path = assets/protobuf
+	url = https://github.com/flipperdevices/flipperzero-protobuf.git
 [submodule "lib/libusb_stm32"]
 	path = lib/libusb_stm32
 	url = https://github.com/flipperdevices/libusb_stm32.git