RFR: 8308995: Update Network IO JFR events to be static mirror events

[Tim Prinzing]

The socket read/write JFR events currently use instrumentation of java.base code using templates in the jdk.jfr modules. This results in some java.base code residing in the jdk.jfr module which is undesirable.

JDK19 added static support for event classes. The old instrumentor classes should be replaced with mirror events using the static support.

In the java.base module:
Added two new events, jdk.internal.event.SocketReadEvent and jdk.internal.event.SocketWriteEvent.
java.net.Socket and sun.nio.ch.SocketChannelImpl were changed to make use of the new events.

In the jdk.jfr module:
jdk.jfr.events.SocketReadEvent and jdk.jfr.events.SocketWriteEvent were changed to be mirror events.
In the package jdk.jfr.internal.instrument, the classes SocketChannelImplInstrumentor, SocketInputStreamInstrumentor, and SocketOutputStreamInstrumentor were removed. The JDKEvents class was updated to reflect all of those changes.

The existing tests in test/jdk/jdk/jfr/event/io continue to pass with the new implementation:
Passed: jdk/jfr/event/io/TestSocketChannelEvents.java
Passed: jdk/jfr/event/io/TestSocketEvents.java

I added a micro benchmark which measures the overhead of handling the jfr socket events.
test/micro/org/openjdk/bench/java/net/SocketEventOverhead.java.
It needs access the jdk.internal.event package, which is done at runtime with annotations that add the extra arguments.
At compile time the build arguments had to be augmented in make/test/BuildMicrobenchmark.gmk

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Commit messages:
 - some changes from review.
 - fix copyright date
 - Added micro benchmark to measure socket event overhead.
 - Some changes from review.
 - remove unnecessary cast
 - 8308995: Update Network IO JFR events to be static mirror events

Changes: https://git.openjdk.org/jdk/pull/14342/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14342&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308995
  Stats: 896 lines in 12 files changed: 523 ins; 367 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/14342.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14342/head:pull/14342

PR: https://git.openjdk.org/jdk/pull/14342