feat(storage): generalize S3 client and watcher interfaces to storage-oriented naming with backward compatibility

ts/classes.file.ts

@@ -12,7 +12,7 @@ export class File {
 
   /**
    * creates a file in draft mode
-   * you need to call .save() to store it in s3
+   * you need to call .save() to store it in object storage
    * @param optionsArg
    */
   public static async create(optionsArg: {