feat: allow conditional revalidation for QUERY requests (#7366)

* feat: allow conditional revalidation for QUERY requests

req.fresh only validated freshness for GET and HEAD, so QUERY responses never returned 304 despite a matching If-None-Match. QUERY is a safe, idempotent, cacheable method that supports conditional requests, so include it in the freshness check.

* docs: include history

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Co-authored-by: Sebastian Beltran <bjohansebas@gmail.com>