feat: add support for "helm get values" command

[afalhambra-hivemq]

Closes #322

Summary

• Adds support for the helm get values command
• Implements the full stack: Go native layer, JNA bridge, and Java command API

Test plan

• Go tests pass (go test ./... in native/)
• Java compilation passes (mvn clean install -Dquickly)

Usage

// Get user-supplied values for a release
String values = Helm.get("my-release")
    .values()
    .withKubeConfig(kubeConfigPath)
    .call();

// Get all values (including chart defaults)
String allValues = Helm.get("my-release")
    .values()
    .allValues()
    .withKubeConfig(kubeConfigPath)
    .call();

// Get values for a specific revision
String revisionValues = Helm.get("my-release")
    .values()
    .withRevision(2)
    .withKubeConfig(kubeConfigPath)
    .call();

[manusa]

LGTM, thx!