Wrap the concurrent futures in an asyncio future

[blink1073]

Follow up to #988

[blink1073]

Ugh, this still won't work:

Deprecated since version 3.10: Deprecation warning is emitted if future is not a Future-like object and loop is not specified and there is no running event loop.

Okay, so we need to detect if there is a running loop and create the appropriate future type.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 71.38%. Comparing base (e61ba81) to head (0ce6e79).
Report is 37 commits behind head on 1.x.

Files with missing lines	Patch %	Lines
jupyter_server/services/kernels/handlers.py	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x    #1000      +/-   ##
==========================================
+ Coverage   71.27%   71.38%   +0.11%     
==========================================
  Files          62       62              
  Lines        7742     7748       +6     
  Branches     1283     1286       +3     
==========================================
+ Hits         5518     5531      +13     
+ Misses       1831     1827       -4     
+ Partials      393      390       -3     

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[kevin-bates]

FWIW - with these changes, I no longer see the issue stemming from #988 (comment).

Thanks @blink1073!