<i18n dev> RFR: 8347949: Currency method to stream available Currencies [v6]

[Justin Lu]

> Please review this PR and CSR which adds a method to _java.util.Currency_ which returns a stream of the available Currencies.
> 
> The motivation can be found in the CSR.

Justin Lu has updated the pull request incrementally with one additional commit since the last revision:

  reflect feedback

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23165/files
  - new: https://git.openjdk.org/jdk/pull/23165/files/46dcf78e..96e86c80

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23165&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23165&range=04-05

  Stats: 60 lines in 2 files changed: 17 ins; 3 del; 40 mod
  Patch: https://git.openjdk.org/jdk/pull/23165.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23165/head:pull/23165

PR: https://git.openjdk.org/jdk/pull/23165