<i18n dev> RFR: 8366829: Add constants for the Duration MIN/MAX values [v3]

[Pavel Rappo]

> We have [recently discussed][] a possibility of adding the `Duration.MIN` and `Duration.MAX` constants. Can we now start implementation? If and when we are in agreement on this PR, I will file a CSR.
> 
> I drafted a minimal specification and added some tests. I tried to phrase the spec for `Duration.MIN` in a way that makes it clear that `Duration.MIN` is the most negative value and not the least positive.
> 
> [recently discussed]: https://mail.openjdk.org/pipermail/core-libs-dev/2025-September/151098.html

Pavel Rappo has updated the pull request incrementally with one additional commit since the last revision:

  Respond to feedback
  
  Apply Stephen's suggestion on wording, although modified.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27534/files
  - new: https://git.openjdk.org/jdk/pull/27534/files/c5a3f228..abe01ff5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27534&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27534&range=01-02

  Stats: 18 lines in 1 file changed: 2 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/27534.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27534/head:pull/27534

PR: https://git.openjdk.org/jdk/pull/27534