Depreciate `Parse.Cloud.beforeSaveFile(() => {})` in preference to `Parse.Cloud.beforeSave(Parse.File, () => {})`

[dblythy]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

Currently, the file triggers have their own unique syntax, which isn't necessary as they follow the standard trigger types (beforeSave, afterSave, etc).

Feature / Enhancement Description

Allow Parse.Cloud.beforeSave(Parse.File) and depreciate existing file methods.

Example Use Case

n/a

Alternatives / Workarounds

n/a

3rd Party References

n/a

[parse-github-assistant]

Thanks for opening this issue!

• 🎉 We are excited about your ideas for improvement!

[mtrezza]

Closing via #7966