RFR: 8319997: JFR: Reduce use of dynamic proxies

[Erik Gahlin]

Hi,

Could I have a review of a change that removes the use of dynamic proxies for known event metadata, for example labels and descriptions.

Testing: test/jdk/jdk/jfr

Thanks

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/19106/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19106&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319997
  Stats: 81 lines in 5 files changed: 21 ins; 35 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/19106.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19106/head:pull/19106

PR: https://git.openjdk.org/jdk/pull/19106