RFR: Merge jdk19

[Jesper Wilhelmsson]

Forwardport JDK 19 -> JDK 20

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Commit messages:
 - Merge remote-tracking branch 'jdk19/master' into Merge_jdk19
 - 8289252: Recommend Locale.of() method instead of the constructor
 - 8288596: Random:from() adapter does not delegate to supplied generator in all cases
 - 8289399: Update SourceVersion to use snippets

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=9330&range=00.0
 - jdk19: https://webrevs.openjdk.org/?repo=jdk&pr=9330&range=00.1

Changes: https://git.openjdk.org/jdk/pull/9330/files
  Stats: 116 lines in 4 files changed: 102 ins; 2 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/9330.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9330/head:pull/9330

PR: https://git.openjdk.org/jdk/pull/9330