Import ensure-sync directly from dependence.

[Carreau]

It seem to me that hiding the fact that ensure_async is from a dependency is counter productive as it adds an unnecessary level of indirection and hide the jupyter_core dependency.

[codecov]

Codecov Report

Base: 79.97% // Head: 80.00% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (917ff5c) compared to base (2cc810a).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1149      +/-   ##
==========================================
+ Coverage   79.97%   80.00%   +0.03%     
==========================================
  Files          68       68              
  Lines        8053     8062       +9     
  Branches     1600     1600              
==========================================
+ Hits         6440     6450      +10     
  Misses       1188     1188              
+ Partials      425      424       -1     

Impacted Files	Coverage Δ
jupyter_server/files/handlers.py	85.45% <100.00%> (ø)
jupyter_server/gateway/managers.py	83.01% <100.00%> (+0.04%)	⬆️
jupyter_server/nbconvert/handlers.py	79.09% <100.00%> (ø)
jupyter_server/serverapp.py	80.29% <100.00%> (+0.10%)	⬆️
jupyter_server/services/api/handlers.py	93.22% <100.00%> (ø)
jupyter_server/services/contents/handlers.py	85.78% <100.00%> (+0.07%)	⬆️
jupyter_server/services/contents/manager.py	86.36% <100.00%> (+0.03%)	⬆️
...ter_server/services/kernels/connection/channels.py	58.71% <100.00%> (ø)
jupyter_server/services/kernels/handlers.py	88.88% <100.00%> (+0.15%)	⬆️
jupyter_server/services/kernels/kernelmanager.py	81.48% <100.00%> (+0.05%)	⬆️
... and 5 more

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[Carreau]

jupyter/jupyter_core#326 is related it updates the typing of ensure_async.

[blink1073]

The functions were originally in this repo, we moved them to jupyter_core so we could use them in other libs. Thanks!