Add CLI

[superstar54]

Add a top-level node-graph cli, which support mount sub-commands using entry-points.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.65%. Comparing base (fe664fe) to head (59260c7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage   90.65%   90.65%           
=======================================
  Files          74       74           
  Lines        7713     7713           
=======================================
  Hits         6992     6992           
  Misses        721      721           

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