feat: create DRF endpoint to get course index context

[ruzniaievdm]

Description

This is part of Course Index PR's

• added course_index DRF endpoint

Please merge it before:

Tested PR - openedx/frontend-app-authoring#598
Untested PR - openedx/frontend-app-authoring#599

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[mphilbrick211]

Hi @ruzniaievdm! Just flagging that there are branch conflicts and some checks that still need to be completed. Would you mind taking a look? Thanks!

[mphilbrick211]

Hi @ruzniaievdm! Just flagging that there are branch conflicts and some checks that still need to be completed. Would you mind taking a look? Thanks!

Hi @ruzniaievdm! Following up on this :)

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[navinkarkera]

@mphilbrick211 The work here is continued in #33667