RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v54]

[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).
> 
> Work was begun in [another PR](https://github.com/openjdk/jdk/pull/18924).

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

  specification clarifications about when clones are happening

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20301/files
  - new: https://git.openjdk.org/jdk/pull/20301/files/888cda7f..5a4937ad

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20301&range=53
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20301&range=52-53

  Stats: 14 lines in 1 file changed: 6 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/20301.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20301/head:pull/20301

PR: https://git.openjdk.org/jdk/pull/20301