RFR: 8351594: JFR: Rate-limited sampling of Java events [v4]

[Erik Gahlin]

> Could I have review of an enhancement that adds rate-limited sampling to Java events, including five events in the JDK (SocketRead, SocketWrite, FileRead, FileWrite, and JavaExceptionThrow).
> 
> Testing: test/jdk/jdk/jfr
> 
> Thanks
> Erik

Erik Gahlin has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into throttle-mania-3
 - Fix adjust boundary
 - Some reviewer feedback
 - Consistent annotation
 - Fix typos
 - Fix whitespace
 - Initial

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25559/files
  - new: https://git.openjdk.org/jdk/pull/25559/files/7fa2db19..59278ca8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25559&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25559&range=02-03

  Stats: 26802 lines in 553 files changed: 20626 ins; 2170 del; 4006 mod
  Patch: https://git.openjdk.org/jdk/pull/25559.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25559/head:pull/25559

PR: https://git.openjdk.org/jdk/pull/25559