RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v26]

[Per Minborg]

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

Per Minborg has updated the pull request incrementally with three additional commits since the last revision:

 - Use static final SV in the snippets
 - Update StableValue main description
 - Add stable collections to MOAT tests

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23972/files
  - new: https://git.openjdk.org/jdk/pull/23972/files/be84045a..0e4ebba9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=25
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=24-25

  Stats: 35 lines in 7 files changed: 19 ins; 0 del; 16 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