Inline pytest_tornasync and add downstream tests

[blink1073]

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[codecov]

Codecov Report

Base: 94.39% // Head: 94.04% // Decreases project coverage by -0.34% ⚠️

Coverage data is based on head (94dc957) compared to base (f377218).
Patch coverage: 93.65% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   94.39%   94.04%   -0.35%     
==========================================
  Files          10       11       +1     
  Lines         464      504      +40     
==========================================
+ Hits          438      474      +36     
- Misses         26       30       +4     

Impacted Files	Coverage Δ
pytest_jupyter/pytest_tornasync.py	91.83% <91.83%> (ø)
pytest_jupyter/jupyter_client.py	90.00% <100.00%> (+0.34%)	⬆️
pytest_jupyter/jupyter_core.py	96.42% <100.00%> (ø)
pytest_jupyter/jupyter_server.py	92.40% <100.00%> (-0.30%)	⬇️

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