Feature: Add http response to event

[ueman]

📜 Description

This PR adds the http response to an event.
See https://sentry.io/organizations/sentry-sdks/issues/3405926130/events/eaa5a7d9bd284b64ab3acd5238c61038/?project=5428562 for an example event.

Depends on #933

💡 Motivation and Context

Partially addresses #624.
There's also some more context in #933 and kuhnroyal#1 (comment).

Also see getsentry/develop#401 for the initial idea.

💚 How did you test it?

new tests

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov-commenter]

Codecov Report

Merging #934 (d8f6268) into main (982893c) will decrease coverage by 0.29%.
The diff coverage is 78.65%.

@@            Coverage Diff             @@
##             main     #934      +/-   ##
==========================================
- Coverage   89.81%   89.52%   -0.30%     
==========================================
  Files         104      105       +1     
  Lines        3212     3292      +80     
==========================================
+ Hits         2885     2947      +62     
- Misses        327      345      +18     

Impacted Files	Coverage Δ
dart/lib/src/protocol/contexts.dart	90.15% <54.54%> (-3.24%)	⬇️
dart/lib/src/protocol/max_body_size.dart	58.33% <58.33%> (ø)
dart/lib/src/protocol/sentry_response.dart	80.00% <80.00%> (ø)
dio/lib/src/dio_event_processor.dart	95.58% <95.83%> (+2.10%)	⬆️
dio/lib/src/sentry_dio_extension.dart	83.33% <100.00%> (+1.51%)	⬆️

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[marandaneto]

@ueman Tests unless you are ok with this being accidentally reverted :P Said once a wise man.

[ueman]

@ueman Tests unless you are ok with this being accidentally reverted :P Said once a wise man.

Yeeees, I just wanted to get some early feedback :D

Also cc @kuhnroyal, I think you're probably interested in this, too.

[kuhnroyal]

Hope I can find some time tomorrow to check it out.

[kuhnroyal]

Looks good to me, ran this and have a nice new context in Sentry :)

[marandaneto]

@ueman thanks for doing this.
If we add tests + changelog, we are ready to merge and ship it.

[marandaneto]

Thanks @ueman as always.