Add ponderedw/dbt_simple_metrics package

[EgorTarsenko]

Description

This PR registers a new package: dbt_simple_metrics published by @ponderedw.

Package Information

• Package Name: dbt_simple_metrics
• GitHub Repo: https://github.com/ponderedw/dbt_simple_metrics
• Description: A utility for generating aggregated SQL from metric definitions in model YAML files, designed with Cube compatibility in mind.

Verification

• Package has a valid dbt_project.yml.
• Package has a README.md.
• Initial release tag v1.0.1 has been pushed to the source repository.
• Folder structure follows data/packages/{publisher}/{package_name}/index.json.

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