Convert oembed to async

[sarayourfriend]

Fixes

Fixes #3457 by @sarayourfriend

Description

Converts the oembed endpoint to async. This was fairly straightforward and hopefully serves as a simpler example of the concept for others to work on additional views, if they wanted.

Testing Instructions

Unit tests should pass. Test the oembed endpoint as well and confirm it works the same as in staging.

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[AetherUnbound]

LGTM, the simplification around testing with pook is great to see, and this can def be used as an example for the future on how to make routes async!

[krysal]

LGTM! It is very pleasant to see how simple the code and tests turned out.

[sarayourfriend]

@krysal Just a heads up, I had to change part of the way #3069 worked because async serializer support does not include to_internal_value, so we can't make the database call in there. The change was just to return only the identifier, and then continue to use aget_object_or_404 with the parsed identifier from the serializer.

[sarayourfriend]

This needs a more careful rebase. Drafting for now.