chore: Removed the setup.cfg file

[lucashuy]

Which issue(s) does this change fix?

None.

Why is this change necessary?

This file only contains a description-file property under the metadata section. This property is now deprecated:

UserWarning: Usage of dash-separated 'description-file' will not be supported in future versions. Please use the underscore name 'description_file' instead

How does it address the issue?

Removes this file. The description is already populated in the setup.py file as description_long.

What side effects does this change have?

None.

Mandatory Checklist

PRs will only be reviewed after checklist is complete

• Add input/output type hints to new functions/methods
• Write design document if needed (Do I need to write a design document?)
• Write/update unit tests
• Write/update integration tests
• Write/update functional tests if needed
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.