* Initial Index API
- Implement main API entry point: build_index
- Rely on GraphRagConfig instead of PipelineConfig
- This unifies the API signature with the
promt_tune and query API entry points
- Derive cache settings, config, and resuming from
the config and other arguments to
simplify/reduce arguments to build_index
- Add preflight config file validations
- Add semver change
* fix smoke tests
* fix smoke tests
* Use asyncio
* Add e2e artifacts in GH actions
* Remove unnecessary E2E test, and add skip_validations flag to cli
* Nicer imports
* Reorganize API functions.
* Add license headers and module docstrings
* Fix ignored ruff rule
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Co-authored-by: Alonso Guevara <alonsog@microsoft.com>
