Regex tools & benchmark rename

[Anilm3]

This PR introduces two small tools:

• simplify_regex: takes a regex as an input and returns the "simplified" regex generated by re2.
• simplify_ruleset: currently takes a ruleset in json format as an input and replaces all regexes by their "simplified" version"

Simplified regexes aren't necessarily simpler, in fact they tend to be longer. However, since these regexes more closely mirror the internal representation of RE2, they should reduce regex compilation time, although in my tests this represented only represented a 1.5% improvement on the whole ruleset.

More interestingly, the simplified regex can be used to better understand what a regex is doing, as the simplified version tends to be more readable.

This PR also renames the benchmark cmake target from benchmark to waf_benchmark as it causes a conflict with the google benchmark library. As a consequence, the benchmark job is expected to fail, it'll work fine after the merge.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.93%. Comparing base (aee070e) to head (9c46b0b).

Additional details and impacted files

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##           master     #290   +/-   ##
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  Coverage   83.93%   83.93%           
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  Files         127      127           
  Lines        5807     5807           
  Branches     2796     2796           
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  Hits         4874     4874           
  Misses        353      353           
  Partials      580      580           

Flag	Coverage Δ
waf_test	83.93% <ø> (ø)

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-05-01 14:19:04

Comparing candidate commit 818eddf in PR branch anilm3/regex-tools with baseline commit 48c6909 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 19 metrics, 0 unstable metrics.