Streaming and raw response support

[m-xim]

Description

• Added HTTPResponse.raise_for_status().

• Added raw response support in HTTPRequest.

• Added support for the stream method.

• Replaced deprecated urllib.getcode() with raw.status.

• AsyncMock() without spec made the sync build_request async too, leaking an unawaited coroutine. Add spec=httpx(2).AsyncClient so only send() is async.

• A shared client couldn't serve consumers with different auth, since middleware came only from self.middleware. Now call_method and call_method_stream take a keyword-only middleware= binds middleware to an endpoint. Both append rather than replace, outermost first: self.middleware -> per-call.

Type of change

• Bug fix (a non-breaking change that resolves an issue)
• New feature (a non-breaking change that adds functionality)
• This change requires a documentation update

Checklist

• My code adheres to the style guidelines of this project (just lint shows no errors)
• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings
• I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• I have ensured that static analysis tests are passing by running just static-analysis
• I have included code examples to illustrate the modifications

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a123619) to head (b3961ad).

Additional details and impacted files

@@            Coverage Diff             @@
##            master       #14    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           32        33     +1     
  Lines          990      1328   +338     
==========================================
+ Hits           990      1328   +338     

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