Refactor/refactor api

[demigod-11]

Pull Request Template

Description

refactored "/gcbm/upload/miscellaneous", "/gcbm/upload/classifiers", "/gcbm/upload/disturbances" endpoints
created a service to handle the endpoint functionality thereby keeping the code clean.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

ran flask locally and pytest

Additional Context (Please include any Screenshots/gifs if relevant)

...

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings
• I have tagged the reviewers in a comment below incase my pull request is ready for a review
• I have signed the commit message to agree to Developer Certificate of Origin (DCO) (to certify that you wrote or otherwise have the right to submit your contribution to the project.) by adding "--signoff" to my git commit command.

[demigod-11]

@SanjaySinghRajpoot

[aornugent]

Hey @demigod-11 - thanks for these changes. We have a lot of areas where our code can be streamlined. Could you please compare #206 and #163 and help us understand if your improvement to the upload endpoint can be made as part of a larger suite of changes?

Closing this for now. Thank you.