Support static assets in the Learning Core runtime

[kdmccormick]

@ormsbee Opening this issue now so that I have something to link TODO comments to :)

Exact details TBD. ADR with details: https://github.com/openedx/openedx-learning/blob/main/docs/decisions/0015-serving-static-assets.rst

[kdmccormick]

In review: openedx/openedx-learning#217

[bradenmacdonald]

openedx/frontend-app-authoring#1242 will soon merge, and then we'll pretty much have everything in place on the frontend to be able to test this: e.g. get a simple HTML XBlock that references a static image to render on the frontend. (Would still require using the python API to upload the image and reference it from the block's OLX though.)

I think that is the simplest case, before we move on to things like copying a block into a modulestore course.

[ormsbee]

Closing this now that openedx/openedx-learning#217 has merged (which gets us enough of this functionality for Sumac).

[ormsbee]

Oh wait, I misread this. Re-opening, since the static asset implementation for edx-platform is incomplete.

[ormsbee]

Next PR:

• XBlock asset support for new libraries experience (WIP) #35557

[Ian2012]

I think this one is closed, right?

[ormsbee]

@Ian2012: Yeah, I feel like this is over-broad at this point. Basic support has been added, though not to the full spec of the ADR. It'll be more useful to break it down into the pieces we care about–it's possible the full ADR version won't happen until after Teak, and that's probably okay.