RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v31]

[Johannes Bechberger]

> This is the code for the [JEP 509: CPU Time based profiling for JFR](https://openjdk.org/jeps/509).
> 
> Currently tested using [this test suite](https://github.com/parttimenerd/basic-profiler-tests). This runs profiles the [Renaissance](https://renaissance.dev/) benchmark with
> - ... different heap sizes
> - ... different GCs
> - ... different samplers (the standard JFR and the new CPU Time Sampler and both)
> - ... different JFR recording durations
> - ... different chunk-sizes

Johannes Bechberger has updated the pull request incrementally with three additional commits since the last revision:

 - Update src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp
   
   Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
 - Update src/hotspot/share/jfr/periodic/sampling/jfrCPUTimeThreadSampler.cpp
   
   Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
 - Small fixes

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25302/files
  - new: https://git.openjdk.org/jdk/pull/25302/files/bef52132..c3dedefb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25302&range=30
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25302&range=29-30

  Stats: 17 lines in 4 files changed: 2 ins; 5 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/25302.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25302/head:pull/25302

PR: https://git.openjdk.org/jdk/pull/25302