feat: add a POST endpoint for listing courses

[viadanna]

Description

This pull request introduces functionality to filter courses using a POST request in the course API. The reason for this is to be able to able to use a filter larger than allowed in GET query params.

The key changes include adding a new test for POST request filtering, modifying the get_queryset method to handle POST data, and adding a POST method to the view.

Testing instructions

1. Make a POST request to /api/courses/v1/courses/ to query for courses.
2. Ensure the results are the same for the GET request.

Deadline

"None" if there's no rush, or provide a specific date or event (and reason) if there is one.

[openedx-webhooks]

Thanks for the pull request, @viadanna!

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[mphilbrick211]

Hi @viadanna! Looks like a few additional tests popped up. Can you see if you can run them?

[viadanna]

Sure thing, done @mphilbrick211

[mphilbrick211]

Apologies, @viadanna - but there's an additional test that needs to be run.

Thank you for your patience. I've put this pull request out to our Core Contributors for review.