feat: add new dbt artifacts support

[gaurpulkit]

Important

This PR adds support for new dbt artifacts run_results and sources, updates the CLI for onboarding these artifacts, and includes new schemas and tests.

• Behavior:
  • Adds support for new dbt artifacts run_results and sources in onboard_file() in utils.py.
  • Updates onboard command in cli.py to handle new artifact paths and validate them.
  • Supports ingestion of manifest, catalog, run_results, sources, and semantic_manifest.
• Schemas:
  • Adds run_results.py and sources.py for new artifact schemas.
  • Updates existing run results and sources parsers to allow extra fields.
• Tests:
  • Adds tests in test_utils.py to verify supported artifact types and error handling for unsupported types.
  • Adds tests in test_artifact_loaders.py for loading run_results and sources.
  • Updates test_cli.py to check CLI help for new artifact options.
  • Includes test data files run_results_v6.json and sources_v3.json.

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