uhv: http-parser: add option to skip header validation

[ameily]

As part of the unified header validation component, the http-parser library will be modified to add an option to disable header validation on a per-request basis. The intent is that header validation will be performed by the UHV and not by each codec / library.

http-parser currently controls how header validation is performed on the compile-time HTTP_PARSER_STRICT preprocessor definition, which is enabled by default. This issue will change http-parser to make this configurable at runtime via a new option.

This is blocked until #19749 is completed.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged "help wanted" or "no stalebot" or other activity occurs. Thank you for your contributions.