feat(ir): add typed builder for JavaToolInstaller@0

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Summary

Adds a typed source-dispatch builder struct for JavaToolInstaller@0 to the ado-aw IR.

Motivation

Previously, any code needing to emit a JavaToolInstaller@0 step had to hand-craft TaskStep::new(...) with raw string input keys. This PR introduces a typed builder that models the three JDK source modes (PreInstalled, LocalDirectory, AzureStorage) as an enum — required per-source inputs become positional parameters and inputs that don't apply to a given source are unrepresentable at compile time.

This complements the existing Gradle@3 and Maven@3 builders: Java-based pipelines can now install the JDK, build, and test entirely through typed IR.

Changes

• src/compile/ir/tasks/java_tool_installer.rs: new JavaToolInstaller builder struct with:
  • JdkSource enum (PreInstalled, LocalDirectory(LocalDirectorySpec), AzureStorage(AzureStorageSpec)) — source-dispatch pattern modelled on Docker (canonical template)
  • JdkArchitecture enum (X64, X86, Arm64) with as_ado_str()
  • LocalDirectorySpec and AzureStorageSpec per-source structs with required positional inputs and typed optional setters
  • Convenience constructors pre_installed, local_directory, azure_storage
  • 8 #[cfg(test)] mod tests unit tests covering all three sources, optional-input absence, architecture tokens, and display name override
• src/compile/ir/tasks/mod.rs: pub mod java_tool_installer; declaration (alphabetical order)

ADO Task Reference

• Task: JavaToolInstaller@0
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/java-tool-installer-v0)
• Required inputs: versionSpec, jdkArchitectureOption, jdkSourceOption
• Per-source required inputs:
  • LocalDirectory: jdkFile, jdkDestinationDirectory
  • AzureStorage: azureStorageAccountName, azureContainerName, azureCommonVirtualFile, jdkDestinationDirectory
• Optional inputs: cleanDestinationDirectory, createExtractDirectory (both sources), azureResourceGroupName (AzureStorage only)

Validation

• cargo build --all-targets
• cargo test
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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Warning

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