RFR: 8305950: Have -XshowSettings option display tzdata version

[Sean Coffey]

minor enhancement to have -XshowSettings launcher option display the version of tzdata installed in the JDK

example output of the new tzdata info :


....
Locale settings:
    default locale = English
    default display locale = English
    default format locale = English
    tzdata version = 2023c
    available locales = , af, af_NA, af_ZA, af_ZA_#Latn, agq, agq_CM, agq_CM_#Latn,
    ......

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Commit messages:
 - 8305950

Changes: https://git.openjdk.org/jdk/pull/13865/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13865&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305950
  Stats: 9 lines in 2 files changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/13865.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13865/head:pull/13865

PR: https://git.openjdk.org/jdk/pull/13865