Add function to obtain required rule data IDs

[Anilm3]

Add a function to obtain the require rule data IDs. This provides the WAF user with the ability to filter and discard unnecessary rule IDs before passing them to the WAF.

[codecov-commenter]

Codecov Report

Merging #104 (e2c465d) into master (ae19584) will increase coverage by 0.16%.
The diff coverage is 63.15%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   65.13%   65.30%   +0.16%     
==========================================
  Files          50       50              
  Lines        2498     2516      +18     
  Branches     1085     1090       +5     
==========================================
+ Hits         1627     1643      +16     
+ Misses        297      293       -4     
- Partials      574      580       +6     

Flag	Coverage Δ
waf_test	65.30% <63.15%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/rule_data_dispatcher.hpp	66.03% <57.14%> (+0.08%)	⬆️
src/interface.cpp	52.89% <60.00%> (+4.24%)	⬆️
src/waf.hpp	100.00% <100.00%> (ø)

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