[fix][fn] Enable optimized Netty direct byte buffer support for Pulsar Function runtimes

[lhotari]

Fixes #22909

Motivation

Netty's optimized direct byte buffer support is needed for high performance. Currently these debug messages will get logged when Netty library gets initialized:

• "direct buffer constructor: unavailable: Unable to make private java.nio.DirectByteBuffer(long,int) accessible: module java.base does not "opens java.nio" to unnamed module"
• "jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable: class io.netty.util.internal.PlatformDependent0$7 cannot access class jdk.internal.misc.Unsafe (in module java.base) because module java.base does not export jdk.internal.misc to unnamed module"
• "java.nio.DirectByteBuffer.(long, {int,long}): unavailable {}"

Another detail is that Pulsar uses com.scurrilous.circe.checksum.Crc32cIntChecksum class for checksum calculation. For optimized checksum calculation Pulsar attempts to load libcirce-checksum native library. When that isn't available, com.scurrilous.circe.checksum.Java9IntHash is used. That only works when "--add-opens java.base/java.util.zip=ALL-UNNAMED" is passed on the command line.

Modifications

Pass these parameters in the Java runtime command line:

 -Dio.netty.tryReflectionSetAccessible=true
 -Dorg.apache.pulsar.shade.io.netty.tryReflectionSetAccessible=true
 -Dio.grpc.netty.shaded.io.netty.tryReflectionSetAccessible=true
 --add-opens java.base/java.nio=ALL-UNNAMED
 --add-opens java.base/jdk.internal.misc=ALL-UNNAMED
 --add-opens java.base/java.util.zip=ALL-UNNAMED

remove --add-opens java.base/sun.net=ALL-UNNAMED added in #16423 since it's no longer needed after #22329

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[cbornet]

LGTM

[eolivelli]

Lgtm