Use native kernel by default

[blink1073]

I ran a comparison of starting a kernel 10 times, executing, and shutting down. Here were the total times:

• echo 24s
• python3 8s
• xpython 8s
• xpython-raw 8s

So much for "echo" being faster. 😅

[kevin-bates]

Thanks Steve.

[codecov]

Codecov Report

Base: 94.52% // Head: 94.50% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (8637dc2) compared to base (84573a1).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
- Coverage   94.52%   94.50%   -0.02%     
==========================================
  Files          12       12              
  Lines         511      510       -1     
==========================================
- Hits          483      482       -1     
  Misses         28       28              

Impacted Files	Coverage Δ
pytest_jupyter/jupyter_server.py	93.22% <ø> (-0.06%)	⬇️
pytest_jupyter/jupyter_client.py	90.32% <100.00%> (+0.32%)	⬆️
tests/test_jupyter_client.py	100.00% <100.00%> (ø)

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