Implement JDK PQC availability detection#6245
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Port #6244 to 4.x
JdkSSLEngineOptions.isPqcAvailable() was hardcoded to false. This PR implements the actual detection using the multi-release JAR pattern already in place:
Base implementation (< JDK 21): returns false
JDK 21+ implementation: checks SSLParameters.getNamedGroups() for the presence of at least one PQ-compliant group (X25519MLKEM768, SecP256r1MLKEM768, SecP384r1MLKEM1024)
JdkSSLEngineOptions.isPqcAvailable() now delegates to JdkDependent.isPqcAvailable(), meaning STRICT and CLIENT_NEGOTIATED enforcement policies will automatically auto-select the JDK engine for PQC once a supporting JDK is available (expected JDK 25 backport, October 2026).