Add support for loop steps in meta schema

[shanejonas]

Fixes #38

Add support for .steps property in loop steps in the meta schema.

• meta-schema.json

  • Add steps property to LoopStep definition.
  • Update required array to include steps.

• src/tests/dependency-resolver.test.ts

  • Add test case for loop step with steps property.

• src/dependency-resolver.ts

  • Update findStepDependencies method to handle steps property in loop steps.
  • Update buildDependencyGraph method to handle steps property in loop steps.

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[github-actions]

🎉 This PR is included in version 1.3.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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