RFR: 8347938: Switch to latest ML-KEM private key encoding [v4]

[Weijun Wang]

> The private key encoding formats of ML-KEM and ML-DSA are updated to match the latest IETF drafts at: https://datatracker.ietf.org/doc/html/draft-ietf-lamps-dilithium-certificates-11 and https://datatracker.ietf.org/doc/html/draft-ietf-lamps-kyber-certificates-10. New security/system properties are introduced to determine which CHOICE a private key is encoded when a new key pair is generated or when `KeyFactory::translateKey` is called.
> 
> Both the encoding and the expanded format are stored inside a `NamedPKCS8Key` now. When loading from a PKCS #8 key, the expanded format is calculated from the input if it's seed only.

Weijun Wang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Merge branch 'master' into 8347938
 - KeyChoices class
 - allow expanded to be null
 - merge
 - Merge
 - safer privKeyToPubKey; updated desciptions for the properties; adding braces to if blocks
 - the fix

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Changes: https://git.openjdk.org/jdk/pull/24969/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24969&range=03
  Stats: 2697 lines in 23 files changed: 1939 ins; 548 del; 210 mod
  Patch: https://git.openjdk.org/jdk/pull/24969.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24969/head:pull/24969

PR: https://git.openjdk.org/jdk/pull/24969