Preserve encoded query parameters in recorded requests

[bensynapse]

I run Live Tennis API.

A recorded request with q=a%2Bb%26c reports two fields, q="a b" and c="". It should report q="a+b&c".
Request.querystring now passes the raw query to parse_qs, which decodes each field once. This also preserves encoded parameter names and literal percent escapes.

The fourteen new cases use requests. They cover encoded parameters, repeated and empty values, and recorded HTTP and HTTPS requests. Eight regressions fail before the fix.

Docker make test passes 252 tests and the separate pook test. Two tests are expected failures, and one is an expected failure that passes.
make safetest passes 232 tests on Python 3.14. make types and the changed file's pre-commit hooks pass.
Existing response close and dependency warnings remain.

Fixes #331.

[mindflayer]

Hi @bensynapse, ideally you should have opened an issue first. Could you please do that and link this PR as the fix for it?

[bensynapse]

I switched the new tests in tests/test_http.py to requests and kept the encoded parameter cases.
I opened issue #331 and linked this PR as its fix.
Docker make test passes 252 tests plus the separate pook test.

[bensynapse]

I renamed it to test_request_querystring_uses_form_urlencoded_semantics in 60ffc9f.
Docker make test passes 252 tests plus the separate pook test.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.85%. Comparing base (3641550) to head (60ffc9f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #330   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files          22       22           
  Lines        1224     1224           
=======================================
  Hits         1210     1210           
  Misses         14       14           

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