Add file triggers and file meta data (#6344)

* added hint to aggregate

* added support for hint in query

* added else clause to aggregate

* fixed tests

* updated tests

* Add tests and clean up

* added beforeSaveFile and afterSaveFile triggers

* Add support for explain

* added some validation

* added support for metadata and tags

* tests?

* trying tests

* added tests

* fixed failing tests

* added some docs for fileObject

* updated hooks to use Parse.File

* added test for already saved file being returned in hook

* added beforeDeleteFile and afterDeleteFile hooks

* removed contentLength because it's already in the header

* added fileSize param to FileTriggerRequest

* added support for client side metadata and tags

* removed fit test

* removed unused import

* added loging to file triggers

* updated error message

* updated error message

* fixed tests

* fixed typos

* Update package.json

* fixed failing test

* fixed error message

* fixed failing tests (hopefully)

* TESTS!!!

* Update FilesAdapter.js

fixed comment

* added test for changing file name

* updated comments

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

spec/FilesController.spec.js

@@ -70,7 +70,7 @@ describe('FilesController', () => {
         expect(log1.level).toBe('error');
 
         const log2 = logs.find(
-          x => x.message === 'Could not store file: yolo.txt.'
+          x => x.message === 'it failed with xyz'
         );
         expect(log2.level).toBe('error');
         expect(log2.code).toBe(130);