Add support for the RFC 10008

[sl1depengwyn]

Related to haskell-servant/servant#1900

Summary

• Add the QUERY method as methodQuery and append QUERY to StdMethod.
• Add hAcceptQuery for the Accept-Query response field name.
• Re-export the new constants, add RFC-linked Haddocks, and extend method/header regression coverage.

This only adds the Accept-Query header name. It does not introduce Structured Fields parsing or a field-specific value model.

Compatibility

QUERY is appended after PATCH, preserving every existing derived Enum value. Adding a constructor to exported StdMethod can still break exhaustive downstream pattern matches, so the Haddocks and changelog target 0.13.

http-types.cabal remains at the currently unreleased 0.12.6; the package-version change is left to release preparation.

[sl1depengwyn]

@Vlix ping in case you missed this

[Vlix]

Thanks for the ping, I'll be gone for a week, but will review this when I get back 👍