Parsers for files defining SELinux policy

[masatake]

https://github.com/SELinuxProject/selinux-notebook/blob/main/src/kernel_policy_language.md#kernel-policy-language

I have used the parsers to study the reference policies of SELinux for years.

[codecov]

Codecov Report

Attention: Patch coverage is 43.26923% with 59 lines in your changes missing coverage. Please review.

Project coverage is 85.92%. Comparing base (ddd08d2) to head (581b606).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
optlib/selinux-type-enforcement.c	0.00%	57 Missing ⚠️
parsers/selinux-interface.c	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4173      +/-   ##
==========================================
- Coverage   85.99%   85.92%   -0.08%     
==========================================
  Files         239      241       +2     
  Lines       58978    59082     +104     
==========================================
+ Hits        50719    50764      +45     
- Misses       8259     8318      +59     

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