feat: Add file beforeFind triggers, file ACL, file cleanup, file references

[dblythy]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

This PR overhauls the File functionality of Parse Server by:

Creating _FileObject class:

This class allows created files to be referenced. Allows files to be created with ACLs, allows file deletion to be controlled by ACLs (currently any user can delete a file if they have the URL)

Creating _FileSession class:

This class creates "presigned urls" for Parse Files. Creates a token that is amended to the File URL. This token is then used in the beforeFind trigger to determine authentication. Will need to work in with directAccess.

Creating _FileReference class:

This class tracks file references per objectId and class, allowing the server to determine whether a file is an orphan.

Introduces ParseServer.cleanupFiles

Developers will need to manually create _FileObject's and _FileReference's for existing deployments. _FileReferences continues to update when objects are accessed.

Closes: #1023 Closes: #8241

Approach

TODOs before merging

• [x] Add tests

[parse-github-assistant[bot]]

I will reformat the title to use the proper commit message syntax.

[parse-github-assistant[bot]]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[dblythy]

There is still a bit to do in this PR - just looking for general feedback about the approach @parse-community/server-review

[kishanio]

Looking forward to something like this.