RFR: 8365638: JFR: Add --exact for debugging out-of-order events

[Erik Gahlin]

Could I have review of PR that add --exact so the failure of a test can be debugged more easily. 

Testing: test/jdk/jdk/jfr/tool/TestPrintContextual.java

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/26812/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26812&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365638
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26812.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26812/head:pull/26812

PR: https://git.openjdk.org/jdk/pull/26812