FileUpload options for Server Config (#7071)

* New: fileUpload options to restrict file uploads

* review changes

* update review

* Update helper.js

* added complete fileUpload values for tests

* fixed config validation

* allow file upload only for authenicated user by default

* fixed inconsistent error messages

* consolidated and extended tests

* minor compacting

* removed irregular whitespace

* added changelog entry

* always allow file upload with master key

* fix lint

* removed fit

Co-authored-by: Manuel Trezza <trezza.m@gmail.com>

src/Options/docs.js

@@ -32,6 +32,7 @@
  * @property {Boolean} expireInactiveSessions Sets wether we should expire the inactive sessions, defaults to true
  * @property {String} fileKey Key for your files
  * @property {Adapter<FilesAdapter>} filesAdapter Adapter module for the files sub-system
+ * @property {FileUploadOptions} fileUpload Options for file uploads
  * @property {String} graphQLPath Mount path for the GraphQL endpoint, defaults to /graphql
  * @property {String} graphQLSchema Full path to your GraphQL custom schema.graphql file
  * @property {String} host The host to serve ParseServer on, defaults to 0.0.0.0
@@ -137,3 +138,10 @@
  * @property {Function} validatorCallback a callback function to be invoked to validate the password
  * @property {String} validatorPattern a RegExp object or a regex string representing the pattern to enforce
  */
+
+/**
+ * @interface FileUploadOptions
+ * @property {Boolean} enableForAnonymousUser Is true if file upload should be allowed for anonymous users.
+ * @property {Boolean} enableForAuthenticatedUser Is true if file upload should be allowed for authenticated users.
+ * @property {Boolean} enableForPublic Is true if file upload should be allowed for anyone, regardless of user authentication.
+ */