RFR: 8353614: JFR: jfr print --exact

[Erik Gahlin]

Could I have a review of an enhancement that adds a command-line switch to `jfr print`, allowing timestamps, time spans, percentages, and byte values to be printed with full precision?

Testing: tier1 + jdk/jdk/jfr

Thank
Erik

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Commit messages:
 - Fix help
 - Improve help
 - Fix formatting
 - Test update, bug fixes and man page
 - Initial

Changes: https://git.openjdk.org/jdk/pull/24372/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24372&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353614
  Stats: 185 lines in 4 files changed: 151 ins; 14 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/24372.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24372/head:pull/24372

PR: https://git.openjdk.org/jdk/pull/24372