feat: add get_collections api

[navinkarkera]

Adds get_collections api for openedx/edx-platform#35324

[openedx-webhooks]

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[rpenido]

@navinkarkera Could you add a test for this new function?

[rpenido]

LGTM 👍
Thank you for your work, @navinkarkera !

• I tested this using the instructions from openedx/edx-platform#35324
• I read through the code
• I checked for accessibility issues
• Includes documentation

@pomegranited This is ready for CC review!

[pomegranited]

@navinkarkera 👍 with one nit/question for @ormsbee , but I'm fine with merging this as-is.

• I tested this using the instructions on openedx/edx-platform#35324
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation
• User-facing strings are extracted for translation N/A

[pomegranited]

The get_components api method sorts its returned results by pk.. should we be doing that here too? It's nice to have APIs return things in a deterministic order (and it makes your tests simpler too).

I can't find an ADR which supports this stance though.. @ormsbee what do you think?

[pomegranited]

And I guess if we sort these results, we should sort those from get_learning_package_collections too.

[navinkarkera]

@pomegranited I agree about making tests simpler, as you can see I had to make use of self.assertQuerySetEqual as the order was not matching in CI.

[navinkarkera]

Updated PR to order by pk, we can remove the commit if @ormsbee does not agree.

[ormsbee]

I originally made it sort by pk as a cheap, lazy way of sorting it by creation time. But I think it's a reasonable default sort in a lot of situations, so this is fine by me.

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