RFR: Implement JEP 509: JFR CPU-Time Profiling [v46]

[Johannes Bechberger]

> This is the code for the [JEP draft: CPU Time based profiling for JFR].
> 
> Currently tested using [this test suite](https://github.com/parttimenerd/basic-profiler-tests).
> 
> A version based on the cooperative sampling JEP can be found [here](https://github.com/parttimenerd/jdk/tree/parttimenerd_cooperative_cpu_time_sampler).

Johannes Bechberger has updated the pull request incrementally with one additional commit since the last revision:

  Fix missing threads and other things

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20752/files
  - new: https://git.openjdk.org/jdk/pull/20752/files/eb3ab54e..ed67e11a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20752&range=45
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20752&range=44-45

  Stats: 166 lines in 4 files changed: 146 ins; 3 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/20752.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20752/head:pull/20752

PR: https://git.openjdk.org/jdk/pull/20752