feat: add support for --set-file flag

[afalhambra-hivemq]

Closes #318

Summary

This PR adds support for Helm's --set-file flag to the Java client, allowing users to set chart values by reading contents from files.

Changes

• Added setFile(String key, Path file) method to InstallCommand, UpgradeCommand, and TemplateCommand
• Implemented support across all layers:
  • Go native layer (InstallOptions, UpgradeOptions, TemplateOptions with SetFiles field)
  • C bindings (FFI layer with setFiles field)
  • JNA bridge layer (InstallOptions.java, UpgradeOptions.java, TemplateOptions.java)
  • Java API layer (InstallCommand.java, UpgradeCommand.java, TemplateCommand.java)
• Refactored URL encoding into a generic method using Function<T, String> mapper
• Added tests for the new functionality

Usage Example

Path configFile = Paths.get("/path/to/config.yaml");
Path scriptFile = Paths.get("/path/to/script.sh");

// Install with file values
Helm.install("my-chart")
  .withName("my-release")
  .setFile("config", configFile)
  .setFile("script", scriptFile)
  .call();

// Upgrade with file values
Helm.upgrade("my-chart")
  .withName("my-release")
  .setFile("config", configFile)
  .call();

// Template with file values
String manifests = Helm.template("my-chart")
  .setFile("config", configFile)
  .call();

Testing

• Added tests in HelmInstallTest, HelmTemplateTest, and HelmKubernetesTest
• All existing tests pass
• Native libraries rebuilt with updated struct definitions

[afalhambra-hivemq]

@manusa - would be so kind to have a look at this PR. Thanks!

[manusa]

LGTM, thx!