[wip] feat: SecRxPreFilter

[M4tteoP]

Implements SecRxPreFilter directive to control @rx prefiltering (#1534) at runtime instead of compile time. This makes adoption easier, being able to enable it on a per-instance basis, without requiring a rebuild.
The coraza.rule.rx_prefilter build tag now only sets the default to On for testing purposes, so we are able to still test the whole test suite with the feature enabled.

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[codecov]

Codecov Report

❌ Patch coverage is 79.16667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.67%. Comparing base (5aa06ee) to head (92e5183).

Files with missing lines	Patch %	Lines
internal/seclang/directives.go	50.00%	2 Missing and 2 partials ⚠️
internal/operators/rxprefilter.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1589      +/-   ##
==========================================
- Coverage   86.70%   86.67%   -0.04%     
==========================================
  Files         179      178       -1     
  Lines        8800     8810      +10     
==========================================
+ Hits         7630     7636       +6     
- Misses        911      914       +3     
- Partials      259      260       +1     

Flag	Coverage Δ
coraza.no_memoize	86.75% <79.16%> (-0.04%)	⬇️
coraza.rule.case_sensitive_args_keys	86.64% <79.16%> (-0.04%)	⬇️
coraza.rule.mandatory_rule_id_check	86.66% <79.16%> (-0.04%)	⬇️
coraza.rule.multiphase_evaluation	86.40% <79.16%> (-0.04%)	⬇️
coraza.rule.no_regex_multiline	86.62% <79.16%> (-0.04%)	⬇️
coraza.rule.rx_prefilter	86.67% <79.16%> (-0.03%)	⬇️
default	86.67% <79.16%> (-0.04%)	⬇️
examples+	16.96% <20.83%> (-0.54%)	⬇️
examples+coraza.no_memoize	84.74% <79.16%> (+0.10%)	⬆️
examples+coraza.rule.case_sensitive_args_keys	84.73% <79.16%> (+0.10%)	⬆️
examples+coraza.rule.mandatory_rule_id_check	84.84% <79.16%> (+0.10%)	⬆️
examples+coraza.rule.multiphase_evaluation	86.40% <79.16%> (-0.04%)	⬇️
examples+coraza.rule.no_regex_multiline	84.66% <79.16%> (+0.11%)	⬆️
examples+coraza.rule.rx_prefilter	84.68% <79.16%> (-0.03%)	⬇️
examples+no_fs_access	84.18% <79.16%> (+0.12%)	⬆️
ftw	86.67% <79.16%> (-0.04%)	⬇️
no_fs_access	86.00% <79.16%> (-0.03%)	⬇️
tinygo	86.66% <79.16%> (-0.04%)	⬇️

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[jptosso]

I love this