Add the addFileNameHash option that allows users to remove the hash f… (#4915)

* Add the addFileNameHash option that allows users to remove the hash from file names

* Change option name to preserveFileName

* Revert changes to package-lock.json

src/Options/index.js

@@ -64,6 +64,9 @@ export interface ParseServerOptions {
   webhookKey: ?string;
   /* Key for your files */
   fileKey: ?string;
+  /* Enable (or disable) the addition of a unique hash to the file names
+  :ENV: PARSE_SERVER_PRESERVE_FILE_NAME */
+  preserveFileName: ?boolean; // = false
   /* Personally identifiable information fields in the user table the should be removed for non-authorized users. */
   userSensitiveFields: ?string[]; // = ["email"]
   /* Enable (or disable) anon users, defaults to true