Add QUERY HTTP method support

[ejsmith]

Summary

• add fluent and JSON helpers for the HTTP QUERY method across the class, functional, and default-export APIs
• expose cache-capable QUERY request options and include QUERY in safe, idempotent retries
• add QUERY support to MockRegistry, request history, documentation, and tests

Why

RFC 10008 defines QUERY as a safe, idempotent, cacheable method with request content. FetchClient should support it with the same typed response, middleware, explicit caching, retry, and testing capabilities as its existing methods.

The retry middleware now preserves body-bearing requests across attempts so a QUERY request can be retried without reusing a consumed body stream.

Validation

• deno task check
• deno task lint
• deno task format-check
• deno task test (196 passed)
• deno task build --set-version 0.0.0 --allow-dirty