feat(file): add option to delete file from storage

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.
• I can reproduce the issue with the latest version of Parse Dashboard.

Issue Description

Any operation on file (delete document containing file, use Delete/Replace File) in Parse Dashboard doesn't delete the file.

Steps to reproduce

1. Upload a file.
2. Replace/delete that file through Parse Dashboard.

Actual Outcome

Checking MongoDB dashboard, the file is still there (in fs.chunks and fs.files)

Expected Outcome

File should be deleted

Pull Request

• PR: #FILL_THIS_OUT

Environment

Dashboard

• Parse Dashboard version: 2.1.0
• Browser (Safari, Chrome, Firefox, Edge, etc.): Edge
• Browser version: Version 92.0.902.73 (Official build) (64-bit)

Server

• Parse Server version: 4.5.0
• Operating system: Windows 10
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Heroku

Database

• System (MongoDB or Postgres): MongoDB
• Database version: 4.4
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): MongoDB Atlas

Logs

Reproduce the issue in Parse Dashboard with MongoDB and inspect the Delete/Replace File flow; run npm run dev if browser errors or source maps are needed. Done means deleting or replacing a file removes its corresponding records from fs.chunks and fs.files.