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.

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

❌ Patch coverage is 95.49550% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.50%. Comparing base (a123619) to head (4c52ea4).

Files with missing lines	Patch %	Lines
src/unihttp/http/stream.py	83.33%	10 Missing ⚠️
src/unihttp/clients/zapros.py	91.07%	5 Missing ⚠️
src/unihttp/http/response.py	42.85%	4 Missing ⚠️
src/unihttp/clients/niquests.py	98.27%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #14      +/-   ##
===========================================
- Coverage   100.00%   98.50%   -1.50%     
===========================================
  Files           32       33       +1     
  Lines          990     1336     +346     
===========================================
+ Hits           990     1316     +326     
- Misses           0       20      +20     

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