[FL-1955] CLI RPC (#781)

- RPC: added CLI command to start session - all input bytes goes into RPC, all RPC output goes into VCP
- RPC: added command to close session (actually it only notifies transport layer)
- RPC: added recursive rmdir
- RPC: hard-coded listing for root directory (any, ext, int)
- Fixed CLI leak
- Fixed furi_record_delete leak
- Unit tests: repaired
- Unit tests: corrected output - remove excess, change dots with progress spinner
- Unit tests: added leak check
- Unit tests: SD mount check before start

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/rpc/rpc_status.c

@@ -9,7 +9,8 @@ void rpc_system_status_ping_process(const PB_Main* msg_request, void* context) {
     msg_response.command_id = msg_request->command_id;
     msg_response.which_content = PB_Main_ping_response_tag;
 
-    rpc_encode_and_send(context, &msg_response);
+    rpc_send_and_release(context, &msg_response);
+    pb_release(&PB_Main_msg, &msg_response);
 }
 
 void* rpc_system_status_alloc(Rpc* rpc) {