Fix handing of kernel_info_request on the control channel

[olexandr-konovalov]

Work in progress - do not merge! Initial attempt, still does not work.

Closes #138

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 26.14%. Comparing base (4a46fcc) to head (63292c3).

Files with missing lines	Patch %	Lines
gap/JupyterKernel.gi	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #139   +/-   ##
=======================================
  Coverage   26.14%   26.14%           
=======================================
  Files          14       14           
  Lines         876      876           
=======================================
  Hits          229      229           
  Misses        647      647           

Files with missing lines	Coverage Δ
gap/JupyterKernel.gi	8.61% <0.00%> (ø)

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