Add a dio_test project and move request integration test

[kuhnroyal]

This was supposed to be just an attempt but while moving the integration test, I found a bug since one of the tests failed for the Http2Adapter. So I think this is a good approach, I will move more tests in future PRs.

• run tests for all adapters
• fix redirect bug for Http2Adapter

New Pull Request Checklist

• [x] I have read the Documentation
• [x] I have searched for a similar pull request in the project and found none
• [x] I have updated this branch with the latest main branch to avoid conflicts (via merge from master or rebase)
• [x] I have added the required tests to prove the fix/feature I'm adding
• [x] I have updated the documentation (if necessary)
• [x] I have run the tests without failures
• [x] I have updated the CHANGELOG.md in the corresponding package

Additional context and info (if any)

[kuhnroyal]

@AlexV525 What do you think about this approach? There is also a bugfix for redirects in here.

[AlexV525]

There is also a bugfix for redirects in here.

Can we extract the fix to another request first?

[kuhnroyal]

There is also a bugfix for redirects in here.

Can we extract the fix to another request first?

Done. See #2101

[kuhnroyal]

I moved some tests in to the test package but I think we should move the rest in separate PRs. So I think this is good to go if we want to take that route.