RFR: 8356816: JFR: Move printing of metadata into separate class

[Erik Gahlin]

Could I have a review of a PR that moves printing of metadata into a separate class?

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/25195/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25195&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356816
  Stats: 311 lines in 3 files changed: 172 ins; 135 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25195.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25195/head:pull/25195

PR: https://git.openjdk.org/jdk/pull/25195