NLB-3682: Allow parsing for http3 module

[xynicole]

Proposed changes

add the http3 module to the parser. https://nginx.org/en/docs/http/ngx_http_v3_module.html

Checklist

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• [x] I have read the CONTRIBUTING document
• [x] If applicable, I have added tests that prove my fix is effective or that my feature works
• [x] If applicable, I have checked that any relevant tests pass after adding my changes
• [ ] I have updated any relevant documentation (README.md)

[agazeley]

Like Dakshina said, could be nice to add a 'bad context' test to each of these directives.