Add YAML support for Terragrunt

[leonavevor]

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Add support for declarative YAML configuration for Terragrunt.

• README.md

  • Add usage instructions and examples for the new YAML-based configuration.

• src/yaml2terragrunt.py

  • Create a script to parse YAML and generate terragrunt.hcl files and directory structures.
  • Implement support for hooks, retries, outputs, variables, parameters, and exclusion of modules similar to Terragrunt.
  • Handle implicit and explicit dependencies using Terragrunt's dependency and dependencies blocks.

• src/tests/sample_tg_declaration.yaml

  • Add a sample YAML configuration file to demonstrate the functionality.

• src/tests/test_yaml2terragrunt.py

  • Write unittests to ensure every aspect works as expected.
  • Test parsing YAML and generating terragrunt.hcl files.
  • Test support for hooks, retries, outputs, variables, parameters, and exclusion of modules.
  • Test handling of implicit and explicit dependencies using Terragrunt's dependency and dependencies blocks.