Allow files to be stored on external media

[Kora3]

New Issue Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.
• [x] I can reproduce the issue with the latest versions of Parse Server and the Parse FS Adapter.

Issue Description

Suggestion: Allow files to be stored on external media

Context :

I want to suggest an improvement that might make the adapter more flexible and adaptable to different file storage needs.

Steps to reproduce

Actual Outcome

Currently, the @parse/fs-files-adapter restricts file storage to the Parse application's parent directory. This can be convenient in many cases, but it can also be cumbersome for users who want to store files on external media, such as a mounted file system.

Expected Outcome

I suggest that the adapter provide the ability to specify a custom storage location for uploaded files, for example, an absolute directory path. This would allow adapter users to choose where they want to store their files based on their specific needs.>

Environment

Client

• Parse Server Push Adapter version: n/a

Server

• Parse Server version: 6.2.1
• Operating system: Ubuntu server
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Local

Database

• System (MongoDB or Postgres): MongoDB
• Database version: 4.2.19
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): Local

Logs

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