RFR: 8331202: Support for Duration until another Instant [v2]

[Stephen Colebourne]

On Mon, 29 Apr 2024 21:32:16 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> 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.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Test with Duration.between()

Marked as reviewed by scolebourne (Author).

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PR Review: https://git.openjdk.org/jdk/pull/19007#pullrequestreview-2030326257