feat: add google benchmark

[fzipi]

what

• create a simple benchmark using google benchmark tooling

why

• have a simple way to testing hypothesis on performance for specific rules based on requests

references

todo

• include more examples?
• verify it can be easily integrated into the build
• only libmodsecurityv3, because it's easier to integrate as library

[sonarqubecloud]

Quality Gate failed

Failed conditions
3 Security Hotspots
17.7% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[dune73]

I do not have time for this, but it looks really cool. Much needed.