RFR: 8310978: JFR events SocketReadEvent/SocketWriteEvent for Socket adaptor ops [v2]

[Tim Prinzing]

> Added jar event support to socket adapters.
> 
> Added the test jdk/jfr/event/io/TestSocketAdapterEvents.java

Tim Prinzing has updated the pull request incrementally with one additional commit since the last revision:

  requested change to location of socket adaptor event logic
  
  bring back event offer semantics where it was fine.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16251/files
  - new: https://git.openjdk.org/jdk/pull/16251/files/05aed00a..06e35acf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16251&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16251&range=00-01

  Stats: 123 lines in 5 files changed: 62 ins; 52 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/16251.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16251/head:pull/16251

PR: https://git.openjdk.org/jdk/pull/16251