RFR: 8331008: KDF Implementation (Preview) [v12]

[Kevin Driver]

> Introduce an API for Key Derivation Functions (KDFs), which are cryptographic algorithms for deriving additional keys from a secret key and other data. See [JEP 478](https://openjdk.org/jeps/478).

Kevin Driver has updated the pull request incrementally with one additional commit since the last revision:

  fleshing out javadocs - wip

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18924/files
  - new: https://git.openjdk.org/jdk/pull/18924/files/3f6ebe8b..c75deb52

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18924&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18924&range=10-11

  Stats: 49 lines in 2 files changed: 34 ins; 1 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/18924.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18924/head:pull/18924

PR: https://git.openjdk.org/jdk/pull/18924