Partially implement core/version-check endpoint.

[costdev]

Pull Request

What changed?

This introduces a partial controller implementation for core/version-check.

Notes:

• partial and rollback values aren't covered (yet, maybe?).
• I've opted for doing it all in a single controller file without DB integration because it's a first iteration and I'm honestly not sure of all of the implementation points within AspireCloud's architecture.
• The URLs are built using config('app.aspirecloud.download.base'). I think that's correct.
• My thinking is that, with the proper additional code, if a package isn't available at AspireCloud, it can be downloaded to AspireCloud for future requests.
• This PR may also serve as a reference point for an alternative PR.

Did you fix any specific issues?

Related: #52

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[costdev]

This data should be compared with the request body's subkey containing the currently installed translation's data including its updated time string. If the updated value is the same as the API's latest translation for that type/slug/version/locale, then no translation is needed. Otherwise, the API should provide the translation offer. If the value isn't set, or there's no body, or otherwise isn't available, the API should provide the translation offer.

[chuckadams]

This will require some extensive modification to fit AC's architecture, and we would definitely want to support rollback, since I don't think mixing backends between AC and .org during a single extended "transaction" would be ideal. I'd like to see some captures of a rollback happening with .org and replay them on AC to ensure we can replicate the resulting state.

[chuckadams]

I'm calling this a work in progress and marking the PR as draft. It has valuable information on things like the query format, so I don't want to see it all drift away if this PR were closed, but it's being put on one of our many back burners.