[crac] RFR: 8350088: [CRaC] Stop & restart JFR recording on checkpoint

[Radim Vansa]

All JFR recordings are closed during checkpoint. After restore JDK starts new recordings with the same parameters as those running before checkpoint. The recordings dumped before checkpoint would be overwritten (as this is a new recording it won't append to the old one).
If `-XX:StartFlightRecorder=...` is passed on restore a new recording is started.

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Commit messages:
 - 8350088: [CRaC] Stop & restart JFR recording on checkpoint

Changes: https://git.openjdk.org/crac/pull/203/files
  Webrev: https://webrevs.openjdk.org/?repo=crac&pr=203&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350088
  Stats: 444 lines in 23 files changed: 440 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/crac/pull/203.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/203/head:pull/203

PR: https://git.openjdk.org/crac/pull/203