Restrict NAP file/dir permissions

[Dean-Coakley]

Proposed changes

• Restrict permissions of NAP directories and files
• Improve error handling of NAP extension
• Lint

Checklist

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

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• 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
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (0854fe6) 66.14% compared to head (416cd22) 66.11%.

Files	Patch %	Lines
...c/extensions/nginx-app-protect/nap/nap_metadata.go	46.15%	6 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
- Coverage   66.14%   66.11%   -0.03%     
==========================================
  Files         118      118              
  Lines       13462    13468       +6     
==========================================
+ Hits         8904     8905       +1     
- Misses       3957     3963       +6     
+ Partials      601      600       -1     

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