RFR: 8288596: Random:from() adapter does not delegate to supplied generator in all cases

[Raffaello Giulietti]

Extend delegation by instance returned by Random.from() to all methods exposed by RandomGenerator.

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Commit messages:
 - 8288596: Random:from() adapter does not delegate to supplied generator in all cases

Changes: https://git.openjdk.org/jdk19/pull/36/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=36&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288596
  Stats: 100 lines in 2 files changed: 97 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk19/pull/36.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/36/head:pull/36

PR: https://git.openjdk.org/jdk19/pull/36