ben-manes / caffeine / #5390

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Integrate async-profiler with JMH and publish flame graphs in CI

- Add -Pasync[=format] to the JMH Gradle plugin. ap-loader 4.3-13 provides
  the native library cross-platform (macOS x64/arm64, Linux x64/arm64); the
  extraction directory is redirected into the build dir to avoid macOS TCC.
  Only one output format is requested at a time because JMH's async-profiler
  integration drops all samples when multiple are combined.
- Add .github/actions/run-benchmark: runs JMH, uploads results to the gist,
  and (when async-profiler is supported) emits a CPU flame graph SVG via
  FlameGraph.pl into the step summary and as an artifact. Skips the profiler
  on OpenJ9 (Semeru) since async-profiler relies on HotSpot-specific APIs.
- Collapse the six per-benchmark workflow jobs into one matrixed job over
  benchmark x JDK (36 cells); publish now depends on a single job.

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