Change parseExtension function to be public

[jkjell]

Summary

Close #1583. The extensions_test.go has also been updated.

Release Note

Changed the pkg/certificate/parseExtensions to be public allowing external Fulcio certificate consumers to parse all x509 extensions into the Extensions struct.

Documentation

None

[haydentherapper]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.02%. Comparing base (cf238ac) to head (352b777).
Report is 29 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1584      +/-   ##
==========================================
+ Coverage   57.93%   60.02%   +2.08%     
==========================================
  Files          50       50              
  Lines        3119     2449     -670     
==========================================
- Hits         1807     1470     -337     
+ Misses       1154      819     -335     
- Partials      158      160       +2     

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