Add feature for limit request to log in middleware logger using status code

[tglman]

Hi,
This is yet a preliminary change to just collect feedback:

So this PR add a new feature on the logger middleware, to limit the logging to a range of status code, so that are logged only some specific status in the range, a simple example that will log only the 400+ request/responses is:

        Logger::default().statuses(StatusCode::BAD_REQUEST..);

Do you like this API is the naming right or you prefer a different one ?
Do you like this? shall I continue 😄 ?

PR Checklist

• Tests for the changes have been added / updated.
  Could not really find a simple way to test this without an application, I didn't see any similar tests for other similar features where could I find/plug a test case for this case ?
• Documentation comments have been added / updated.
  work in progress
• A changelog entry has been made for the appropriate packages.
  will do
• Format code with the latest stable rustfmt.
• (Team) Label with affected crates and semver status.

[tglman]

Hi,

I did add a simple dev-dependency to capture logs and check them in the tests, so I could add some tests that check the full flow, I updated also some existing tests to check that the output is what is expected.

Now this PR should be complete of all the requirements.

Regards