Listen to ContentsManager save events

[dlqqq]

• Allow for JS1 to be used alongside File ID extension
• Listen to ContentsManager save events and update stat info in the Files table accordingly (see get_path(id) fails if file changed on disk? #15)

[codecov-commenter]

Codecov Report

Base: 78.34% // Head: 78.59% // Increases project coverage by +0.24% 🎉

Coverage data is based on head (244260a) compared to base (56aec65).
Patch coverage: 65.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   78.34%   78.59%   +0.24%     
==========================================
  Files           5        5              
  Lines         351      369      +18     
  Branches       49       51       +2     
==========================================
+ Hits          275      290      +15     
- Misses         62       65       +3     
  Partials       14       14              

Impacted Files	Coverage Δ
jupyter_server_fileid/extension.py	44.82% <16.66%> (-5.18%)	⬇️
jupyter_server_fileid/manager.py	88.60% <77.77%> (+0.88%)	⬆️
jupyter_server_fileid/pytest_plugin.py	97.91% <100.00%> (+0.18%)	⬆️

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[dlqqq]

Requires JS>=1.15: jupyter-server/jupyter_server@49dfe2e