feat(cli): global file specs support

[Davidyz]

• copy global specs to .vectorcode/ when initialising a project
• fallback to global specs when project specs are not found.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.78%. Comparing base (7b82531) to head (30ca7a6).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   97.60%   97.78%   +0.18%     
==========================================
  Files          18       18              
  Lines        1169     1176       +7     
==========================================
+ Hits         1141     1150       +9     
+ Misses         28       26       -2     

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