RFR: 8310978: JFR events SocketReadEvent/SocketWriteEvent for Socket adaptor ops [v4]

[Tim Prinzing]

> Added jfr 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:

  various fixups:
  
  - propagate TestSocketAdaptorEvents changes to TestSocketEvents and
    TestSocketChannelEvents.
  - copyright fixups
  - additional test tags

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16251/files
  - new: https://git.openjdk.org/jdk/pull/16251/files/625fc6a5..4b0daa5e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16251&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16251&range=02-03

  Stats: 20 lines in 5 files changed: 8 ins; 1 del; 11 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