RFR: 8331202: Support for Duration until another Instant

[Naoto Sato]

A new method on Instant to return the duration `until` another Instant is suggested per the following discussion thread:

https://mail.openjdk.org/pipermail/core-libs-dev/2024-April/122131.html

A CSR has also been drafted.

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Commit messages:
 - Prefer until over between
 - nonnull
 - Internal suggestions, added a test
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/19007/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19007&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331202
  Stats: 62 lines in 2 files changed: 59 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19007.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19007/head:pull/19007

PR: https://git.openjdk.org/jdk/pull/19007