[FL-2415] Storage: blocking file open (#1078)

* Storage: correct replacement for "/any" path in path holder
* Unit tests: storage, blocking file open test
* File stream: error getter
* Storage: common copy and common remove now executes in external thread
* Filesystems: got rid of unused functions
* Storage: untangle dependencies, ram-frendly filesystem api
* iButton: context assertions
* Storage: pubsub messages
* Storage: wait for the file to close if it was open
* Storage: fix folder copying
* Storage: unit test
* Storage: pubsub documentation
* Fix merge error
* Fix memleak in storage test
* Storage: remove unused define

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

lib/toolbox/stream/file_stream.h

@@ -35,6 +35,13 @@ bool file_stream_open(
  */
 bool file_stream_close(Stream* stream);
 
+/** 
+ * Retrieves the error id from the file object
+ * @param stream pointer to stream object.
+ * @return FS_Error error id
+ */
+FS_Error file_stream_get_error(Stream* stream);
+
 #ifdef __cplusplus
 }
 #endif