<i18n dev> RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview) [v18]

[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.

Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 104 additional commits since the last revision:

 - Merge branch 'master' into lazy-constants
 - Revert the AbstractMap.keySet @Stable annotation
 - Update docs after comments
 - Improve method docs
 - Improve equals/hashCode document
 - Update wording on List/Map Object methods
 - Update javadocs
 - Fix test descriptions
 - Update first javadoc sentence
 - Rephrase docs on interrupt
 - ... and 94 more: https://git.openjdk.org/jdk/compare/e2f6db0f...fc064e47

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27605/files
  - new: https://git.openjdk.org/jdk/pull/27605/files/698b4125..fc064e47

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27605&range=17
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27605&range=16-17

  Stats: 8176 lines in 211 files changed: 4888 ins; 2457 del; 831 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