RFR: 8331008: Implement JEP 478: Key Derivation Function API (Preview) [v7]

[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:

  initialize lock in alternate private constructor

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20301/files
  - new: https://git.openjdk.org/jdk/pull/20301/files/f30c4b65..efa5246d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20301&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20301&range=05-06

  Stats: 13 lines in 2 files changed: 0 ins; 10 del; 3 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