RFR: 8351565: Implement JEP 502: Stable Values (Preview) [v25]

[Per Minborg]

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

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

 - Add lazy toSting for StableMap::values
 - Make toString for reversed and sublist lazy

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23972/files
  - new: https://git.openjdk.org/jdk/pull/23972/files/dfb940be..be84045a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=24
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23972&range=23-24

  Stats: 122 lines in 5 files changed: 101 ins; 0 del; 21 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