Add pem-api module: PEMDecoder/PEMEncoder (JEP 538 preview on JDK 27, JEP 542 final in JDK 28) for JWT keys, TLS, encrypted keys and BouncyCastle migration

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz

pem-api/fixtures/server-chain.pem

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