[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/services/storage/filesystem_api.c

@@ -0,0 +1,38 @@
+#include "filesystem_api_defines.h"
+
+const char* filesystem_api_error_get_desc(FS_Error error_id) {
+    const char* result = "unknown error";
+    switch(error_id) {
+    case(FSE_OK):
+        result = "OK";
+        break;
+    case(FSE_NOT_READY):
+        result = "filesystem not ready";
+        break;
+    case(FSE_EXIST):
+        result = "file/dir already exist";
+        break;
+    case(FSE_NOT_EXIST):
+        result = "file/dir not exist";
+        break;
+    case(FSE_INVALID_PARAMETER):
+        result = "invalid parameter";
+        break;
+    case(FSE_DENIED):
+        result = "access denied";
+        break;
+    case(FSE_INVALID_NAME):
+        result = "invalid name/path";
+        break;
+    case(FSE_INTERNAL):
+        result = "internal error";
+        break;
+    case(FSE_NOT_IMPLEMENTED):
+        result = "function not implemented";
+        break;
+    case(FSE_ALREADY_OPEN):
+        result = "file is already open";
+        break;
+    }
+    return result;
+}