[Feature Request]: Enable to configure `--add-modules` jvm flag

[Abacn]

What would you like to happen?

There are interests to leverage the new Vector API (AVX2 CPU instructions) in Java [1], which requires special JVM flags for activation (--add-modules=jdk.incubator.vector). However, Java SDK container current does not expose this option. But similarly, we do support user config --add-opens JVM options: https://github.com/apache/beam/blob/aefcada11037fc465f79225c28256c0d4fcd940e/sdks/java/container/boot.go#L233

We may consider add similar support for --add-modules flags.

[1] https://docs.oracle.com/en/java/javase/21/docs/api/jdk.incubator.vector/jdk/incubator/vector/package-summary.html

Issue Priority

Priority: 3 (nice-to-have improvement)

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