[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>

applications/storage/storage.h

@@ -1,5 +1,6 @@
 #pragma once
-#include <furi.h>
+#include <stdint.h>
+#include <m-string.h>
 #include "filesystem_api_defines.h"
 #include "storage_sd_api.h"
 
@@ -18,6 +19,23 @@ File* storage_file_alloc(Storage* storage);
  */
 void storage_file_free(File* file);
 
+typedef enum {
+    StorageEventTypeCardMount,
+    StorageEventTypeCardUnmount,
+    StorageEventTypeCardMountError,
+    StorageEventTypeFileClose,
+} StorageEventType;
+
+typedef struct {
+    StorageEventType type;
+} StorageEvent;
+
+/**
+ * Get storage pubsub.
+ * Storage will send StorageEvent messages.
+ * @param storage 
+ * @return FuriPubSub* 
+ */
 FuriPubSub* storage_get_pubsub(Storage* storage);
 
 /******************* File Functions *******************/