<i18n dev> RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview)

[Per Minborg]

Implement JEP 526: Lazy Constants (Second Preview)

The lazy list/map implementations are broken out from `ImmutableCollections` to a separate class.

The old benchmarks are not moved/renamed to allow comparison with previous releases.

`java.util.Optional` is updated so that its field is annotated with `@Stable`.  This is to allow `Optional` instances to be held in lazy constants and still provide constant folding.

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Commit messages:
 - Add optimization where the computing function is returned directly
 - Add benchmark of Optionals
 - Merge branch 'master' into lazy-constants
 - Update src/java.base/share/classes/java/lang/LazyConstant.java
 - Update src/java.base/share/classes/java/util/LazyCollections.java
 - Fix failing test
 - Clean up
 - Merge branch 'master' into lazy-constants
 - Update JEP number
 - Fix doc issues
 - ... and 76 more: https://git.openjdk.org/jdk/compare/1605e839...3e287031

Changes: https://git.openjdk.org/jdk/pull/27605/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27605&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366178
  Stats: 8721 lines in 60 files changed: 4112 ins; 4490 del; 119 mod
  Patch: https://git.openjdk.org/jdk/pull/27605.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27605/head:pull/27605

PR: https://git.openjdk.org/jdk/pull/27605