go generate support for private modules(currently NAP)

[dengsh12]

Proposed changes

• Add NAP into go generate. To hide the private link from public repo we use environment variables. If in the future we want to add other private modules, we can go similar way.
• Add .gen.go suffix to generated NAP analyze_appprotectWAF{version}_directives

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.57%. Comparing base (bb4f6db) to head (9df28dc).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #116   +/-   ##
=======================================
  Coverage   76.57%   76.57%           
=======================================
  Files          26       26           
  Lines        1161     1161           
=======================================
  Hits          889      889           
  Misses        216      216           
  Partials       56       56           

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