Implement and test new feature phase by phase

[ctn]

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name: Pull request
about: Contribute to the OpenSSM project

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Describe the changes
This PR completes the implementation of the Datest framework as outlined in datest/.design/3d-design.md. It covers:

• Phase 2: Dana Integration: Introduction of data models (datest/models.py), a Dana assertion parser (datest/assertions.py), and enhancements to the executor and reporter to handle structured Dana test output.
• Phase 3: Polish & Integration: Implementation of a pytest plugin (datest/pytest_plugin.py) for seamless Dana test discovery and execution within pytest, a robust configuration system (datest/config.py) supporting datest.toml and pyproject.toml, and an enhanced CLI.

Additionally, datest/.design/3d-design.md has been updated to reflect the completion of these phases, and a new IMPLEMENTATION_SUMMARY.md has been added detailing the implemented features and project structure. A sample datest.toml configuration file is also included.

Related issues
Implements the design and implementation plan detailed in datest/.design/3d-design.md.

Tests
Comprehensive unit, integration, and end-to-end tests have been added:

• tests/unit/: New unit tests for datest/models.py, datest/assertions.py, datest/config.py, and datest/executor.py.
• tests/integration/: Integration tests covering the full Dana test pipeline.
• tests/e2e/: End-to-end tests for CLI functionality and configuration loading.
• Existing tests/fixtures/ are used for testing.

Checklist

• I have added tests that prove my changes are effective or that my feature works
• I have added necessary documentation (if appropriate)

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