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

["Abacn (via GitHub)" <gi...@apache.org>]

Abacn opened a new issue, #30281:
URL: https://github.com/apache/beam/issues/30281

   ### 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)
   
   ### Issue Components
   
   - [ ] Component: Python SDK
   - [X] Component: Java SDK
   - [ ] Component: Go SDK
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   - [ ] Component: IO connector
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