<i18n dev> RFR: 8367271: Add parsing tests to DateFormat JMH benchmark

[Justin Lu]

This PR expands the DateFormat benchmark with parsing cases (in addition to the existing formatting ones) such that performance regressions are easier to identify for parsing. Also adding in a time instance and respective measurement tests.  The patterns used correspond to FULL Locale.ENGLISH patterns (w/ the NBSP replaced for time pattern for clarity sake).

Further context in comment on JBS issue.

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Commit messages:
 - Isolate test data from formats
 - init

Changes: https://git.openjdk.org/jdk/pull/27204/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27204&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367271
  Stats: 39 lines in 1 file changed: 34 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27204.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27204/head:pull/27204

PR: https://git.openjdk.org/jdk/pull/27204