Add `content_type` for Response

[Sanchoyzer]

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Summary

I would like to suggest adding a little syntax sugar. It might be more convenient to use response.content_type instead of response.headers.get("Content-Type"). I hope I haven't forgotten any places where changes need to be made

Checklist

• [x] I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.

[Sanchoyzer]

Hey, @tomchristie , what do you think of this suggestion?

[Kludex]

I think this is not needed, but we can see what other maintainers think about it.

[lovelydinosaur]

what do you think of this suggestion?

I think this is not needed, but we can see what other maintainers think about it.

Indeed. Appreciate the interest tho.