[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>

core/furi/record.c

@@ -85,6 +85,7 @@ bool furi_record_destroy(const char* name) {
     furi_assert(record_data);
     if(record_data->holders_count == 0) {
         FuriRecordDataDict_erase(furi_record->records, name_str);
+        furi_check(osOK == osEventFlagsDelete(record_data->flags));
         ret = true;
     }