Support httpx2 via httpcore2

[lundberg]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (06091fa) to head (9e1ef9d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #317   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        23    +1     
  Lines         2996      3003    +7     
  Branches       204       204           
=========================================
+ Hits          2996      3003    +7     

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[Kludex]

I think it's not that helpful now, but since the package will evolve, testing the whole suite on it may be a good idea.

Maybe the following gives a good setup (not sure):

@pytest.fixture(params=[httpx, httpx2])
async def httpx_module(request):
    return request.param