feat(findWorkspaceDir): add support for Deno workspace detection

[outslept]

resolves #230

[pi0]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.22%. Comparing base (afdf7cb) to head (1b26a87).
Report is 80 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   89.40%   91.22%   +1.82%     
==========================================
  Files           5       10       +5     
  Lines         434      262     -172     
  Branches       37       61      +24     
==========================================
- Hits          388      239     -149     
+ Misses         46       23      -23     

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