Add native JDK support for UDS on Java 16+

[sarahchen6]

This PR introduces native JDK support for UDS, which was added in Java 16: https://openjdk.org/jeps/380. This is done by:

• Adding a new configuration option enableJdkSocket to enable native JDK support for UDS for compatible versions (Java 16+)
• Updating primarily NonBlockingStatsDClient, NonBlockingStatsDClientBuilder, and UnixStreamClientChannel. UnixDatagramClientChannel cannot be updated at this time.
• Adding a VersionUtils file that parses Java versions.

This PR follows DataDog/dd-trace-java#8314, which added native JDK support to dd-trace-java. With native support, we can reduce third party (i.e. jnr-unixsocket) dependencies.

[bric3]

@carlosroman Any update on this ?

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Pull request overview

This PR adds an optional native-JDK (Java 16+) Unix Domain Socket (UDS) implementation path, reducing reliance on jnr-unixsocket when running on modern JDKs while keeping compatibility with older versions.

Changes:

• Adds enableJdkSocket configuration and plumbing through the builder/client to enable native JDK UDS support on Java 16+.
• Introduces VersionUtils for Java version parsing plus reflective access to StandardProtocolFamily.UNIX and UnixDomainSocketAddress.
• Updates UnixStreamClientChannel to use native SocketChannel for UDS stream connections when enabled; adjusts tests accordingly.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/main/java/com/timgroup/statsd/NonBlockingStatsDClient.java	Passes enableJdkSocket into channel creation.
src/main/java/com/timgroup/statsd/NonBlockingStatsDClientBuilder.java	Adds enableJdkSocket option and uses it during unix URL resolution.
src/main/java/com/timgroup/statsd/UnixStreamClientChannel.java	Implements native-JDK UDS stream connect/write behavior behind a Java 16+ + flag gate.
src/main/java/com/timgroup/statsd/UnixDatagramClientChannel.java	Documents why native JDK UDS datagram isn’t available yet.
src/main/java/com/timgroup/statsd/VersionUtils.java	Adds Java version parsing and reflection helpers for Java 16+ UDS APIs.
src/test/java/com/timgroup/statsd/BuilderAddressTest.java	Adjusts address assertions to tolerate native-JDK address types.
src/test/java/com/timgroup/statsd/NonBlockingStatsDClientTest.java	Updates overridden createByteChannel signatures for the new parameter.
src/test/java/com/timgroup/statsd/UnixStreamSocketDummyStatsDServer.java	Minor refactor in unix socket bind setup.
src/test/java/com/timgroup/statsd/UnixStreamSocketTest.java	Tweaks UDS stream test behavior/assertions.

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[sarahchen6]

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