<i18n dev> RFR: JDK-8314611: Provide more explicative error message parsing Currencies

Mon Aug 28 21:22:42 UTC 2023

Please review this PR which updates some exceptions in j.util.Currency to have an explicit error message (as opposed to nothing).

The exceptions occur in the two static `getInstance()` methods. They are thrown generally when the ISO 4217/3166 currency/country codes are in an invalid form, or do not exist.

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Commit messages:
 - line breaks
 - Invalid implies not length of 3
 - init

Changes: https://git.openjdk.org/jdk/pull/15458/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15458&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314611
  Stats: 37 lines in 2 files changed: 26 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/15458.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15458/head:pull/15458

PR: https://git.openjdk.org/jdk/pull/15458