feat(ir): add typed builder for Maven@3

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Summary

Adds a typed builder struct for Maven@3 to the ado-aw IR.

Motivation

Previously, any code that needed to emit a Maven build step had to hand-craft
TaskStep::new("Maven@3", ...) with raw string input keys. This PR introduces
a typed builder struct (new(maven_pom_file) + typed optional setters +
into_step()) so the POM-file path is positional, all optional inputs and
their constrained values are type-checked, and call sites stop using
stringly-typed keys.

Three typed enums make constrained values unrepresentable with wrong strings:

• CodeCoverageTool — None | Cobertura | JaCoCo
• JdkVersion — Default | V21 | V17 | V11 | V10 | V9 | V8 | V7 | V6
• JdkArchitecture — X86 | X64 | Arm64

Changes

• src/compile/ir/tasks/maven.rs: new Maven builder struct with typed enums
  and 12 #[cfg(test)] unit tests covering all input groups
• src/compile/ir/tasks/mod.rs: pub mod maven; declaration (alphabetical)

ADO Task Reference

• Task: Maven@3
• Docs: (https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/maven-v3)
• Required inputs: mavenPOMFile
• Optional inputs: goals, options, publishJUnitResults, testResultsFiles,
  testRunTitle, allowBrokenSymlinks, codeCoverageToolOption,
  codeCoverageClassFilter, codeCoverageClassFilesDirectories,
  codeCoverageSourceDirectories, codeCoverageFailIfEmpty,
  codeCoverageRestoreOriginalPomXml, jdkVersionOption,
  jdkArchitectureOption, mavenOptions, mavenAuthenticateFeed,
  checkStyleRunAnalysis, pmdRunAnalysis, spotBugsRunAnalysis

Validation

• cargo build --all-targets
• cargo test — 12 new unit tests, all pass, no existing tests broken
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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