Add query() route method for the HTTP QUERY verb (RFC 10008)

[purwantoid]

Summary

The HTTP QUERY method was recently published as RFC 10008 on the IETF Standards Track. It is a safe, cacheable method that carries its query in the request body, enabling expressive queries without the URL-length and cacheability trade-offs of GET vs. POST. Support for QUERY is landing across the ecosystem, so this adds a query() helper as a sibling of the existing get()/post()/put()/patch()/delete()/options() route methods.

• Adds query() to RouteCollectorProxyInterface and its implementation in RouteCollectorProxy, equivalent to map(['QUERY'], $pattern, $callable).
• Deliberately not added to any()'s method list, so existing any() routes are unaffected.
• Adds a CHANGELOG entry under [Unreleased] / Added.

$app->query('/search', function (Request $request, Response $response) {
    $criteria = (string) $request->getBody();
    // ...run the query described in the request body...
    return $response;
});

Test plan

• vendor/bin/phpunit — full suite passes (437 tests)
• vendor/bin/phpcs — clean (PSR-12)
• vendor/bin/phpstan --memory-limit=-1 — clean (level max)
• Added RouteCollectorProxyTest::testQuery() (unit-level, mirrors testOptions())
• Added AppTest::testQueryRoute() (end-to-end, mirrors the GET/POST/etc. verb test)

[coveralls]

coverage: 99.455%. remained the same — purwantoid:add-http-query-method into slimphp:4.x