Add client plugin and echo kernel

[blink1073]

Fixes #18

[codecov]

Codecov Report

Base: 86.45% // Head: 94.70% // Increases project coverage by +8.25% 🎉

Coverage data is based on head (1a7df48) compared to base (9b58f0b).
Patch coverage: 94.89% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   86.45%   94.70%   +8.25%     
==========================================
  Files           5       10       +5     
  Lines         310      453     +143     
  Branches       69        0      -69     
==========================================
+ Hits          268      429     +161     
- Misses         20       24       +4     
+ Partials       22        0      -22     

Impacted Files	Coverage Δ
pytest_jupyter/jupyter_client.py	92.85% <92.85%> (ø)
pytest_jupyter/echo_kernel.py	94.73% <94.73%> (ø)
pytest_jupyter/__init__.py	100.00% <100.00%> (ø)
pytest_jupyter/jupyter_server.py	92.85% <100.00%> (+8.06%)	⬆️
tests/conftest.py	100.00% <100.00%> (ø)
tests/test_jupyter_client.py	100.00% <100.00%> (ø)
tests/test_jupyter_server.py	100.00% <100.00%> (ø)
pytest_jupyter/_version.py
tests/test_jupyter_core.py	100.00% <0.00%> (ø)
... and 3 more

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