RFR: 8324832: JFR: Improve sorting of 'jfr summary'

[Erik Gahlin]

Could I have a review of a change that improves the sorting for the summary command. 

Testing: /test/jdk/jdk/jfr/tool

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/17637/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17637&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324832
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17637.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17637/head:pull/17637

PR: https://git.openjdk.org/jdk/pull/17637