RFR: 8308108: Support Unicode extension for collation settings [v5]

[Naoto Sato]

On Mon, 22 May 2023 17:59:18 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This change intends to interpret the BCP47 U extension wrt collation settings in the given `Locale`, then applies them to the created instances in the 1-arg factory method in `Collator`. A corresponding CSR has also been drafted.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Further clarifying the method description

Thanks, Alan. Clarified the method doc based on your suggestion.

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PR Comment: https://git.openjdk.org/jdk/pull/14040#issuecomment-1557663088