<i18n dev> RFR: 8347955: TimeZone methods to stream the available timezone IDs [v4]

[Justin Lu]

> Please review this PR and CSR which add a pair of methods to _java.util.TimeZone_ that return a stream of the available IDs. See the CSR for the motivation.
> 
> A number of existing tests are modified to use the new methods. See _test/jdk/java/util/TimeZone/AvailableIDsTest.java_ which tests the new methods.

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

  new methods do not need to be synchronized

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23251/files
  - new: https://git.openjdk.org/jdk/pull/23251/files/db907223..ef3e275b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23251&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23251&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23251.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23251/head:pull/23251

PR: https://git.openjdk.org/jdk/pull/23251