RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v42]

[Per Minborg]

> Implement JEP 502.
> 
> The PR passes tier1-tier3 tests.

Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 295 commits:

 - Update doces
 - Merge branch 'master' into implement-jep502
 - Merge branch 'master' into implement-jep502
 - Address comments on docs
 - Make the sqrt example different
 - Specify that an exception is thrown for illegal inputs
 - Clean up StableValue docs
 - Break out and move performance related text
 - Move Serializable specs to @implNote
 - Address comments
 - ... and 285 more: https://git.openjdk.org/jdk/compare/d1e91fcd...f1d96441

-------------

Changes: https://git.openjdk.org/jdk/pull/23972/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=41
  Stats: 4558 lines in 30 files changed: 4536 ins; 0 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/23972.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23972/head:pull/23972

PR: https://git.openjdk.org/jdk/pull/23972