[FL-3055] Getter for application data path (#2181)

* Threads: application id
* Unit tests: appsdata getter test
* Unit tests: moar test cases for appsdata getter
* Unit tests: remove folders after test
* Storage: dir_is_exist, migrate, + unit_tests
* Plugins: migration
* Storage: common_exists, moar unit_tests 4 "common_migrate", "common_migrate" and "common_merge" bugfixes
* Storage: use FuriString for path handling
* Storage API: send caller thread id with path
* Storage: remove StorageType field in storage file list
* Storage: simplify processing
* Storage API: send caller thread id with path everywhere
* Storage: /app alias, unit tests and path creation
* Storage, path helper: remove unused
* Examples: app data example
* App plugins: use new VFS path
* Storage: file_info_is_dir
* Services: handle alias if the service accepts a path.
* App plugins: fixes
* Make PVS happy
* Storage: fix storage_merge_recursive
* Storage: rename process_aliases to resolve_path. Rename APPS_DATA to APP_DATA.
* Apps: use predefined macro instead of raw paths. Example Apps Data: README fixes.
* Storage: rename storage_common_resolve_path to storage_common_resolve_path_and_ensure_app_directory
* Api: fix version
* Storage: rename alias message
* Storage: do not create app folders in path resolving process in certain cases.

---------

Co-authored-by: Astra <93453568+Astrrra@users.noreply.github.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

applications/services/storage/storage.h

@@ -10,10 +10,12 @@ extern "C" {
 #define STORAGE_INT_PATH_PREFIX "/int"
 #define STORAGE_EXT_PATH_PREFIX "/ext"
 #define STORAGE_ANY_PATH_PREFIX "/any"
+#define STORAGE_APP_DATA_PATH_PREFIX "/app"
 
 #define INT_PATH(path) STORAGE_INT_PATH_PREFIX "/" path
 #define EXT_PATH(path) STORAGE_EXT_PATH_PREFIX "/" path
 #define ANY_PATH(path) STORAGE_ANY_PATH_PREFIX "/" path
+#define APP_DATA_PATH(path) STORAGE_APP_DATA_PATH_PREFIX "/" path
 
 #define RECORD_STORAGE "storage"
 
@@ -175,6 +177,15 @@ bool storage_dir_read(File* file, FileInfo* fileinfo, char* name, uint16_t name_
  */
 bool storage_dir_rewind(File* file);
 
+/**
+ * @brief Check that dir exists
+ * 
+ * @param storage 
+ * @param path 
+ * @return bool 
+ */
+bool storage_dir_exists(Storage* storage, const char* path);
+
 /******************* Common Functions *******************/
 
 /** Retrieves unix timestamp of last access
@@ -246,6 +257,36 @@ FS_Error storage_common_fs_info(
     uint64_t* total_space,
     uint64_t* free_space);
 
+/**
+ * @brief Parse aliases in path and replace them with real path
+ * Also will create special folders if they are not exist
+ * 
+ * @param storage 
+ * @param path 
+ * @return bool 
+ */
+void storage_common_resolve_path_and_ensure_app_directory(Storage* storage, FuriString* path);
+
+/**
+ * @brief Move content of one folder to another, with rename of all conflicting files. 
+ * Source folder will be deleted if the migration is successful.
+ * 
+ * @param storage 
+ * @param source 
+ * @param dest 
+ * @return FS_Error 
+ */
+FS_Error storage_common_migrate(Storage* storage, const char* source, const char* dest);
+
+/**
+ * @brief Check that file or dir exists
+ * 
+ * @param storage 
+ * @param path 
+ * @return bool 
+ */
+bool storage_common_exists(Storage* storage, const char* path);
+
 /******************* Error Functions *******************/
 
 /** Retrieves the error text from the error id