feat: add accuracy tag to behave scenarios

[rgonalo]

This pull request introduces support for accuracy tags in Behave scenarios, allowing tests involving AI-generated content to specify required accuracy levels and the number of retries. It adds documentation, implementation, and tests for this feature, and integrates it into the Behave environment setup. The changes also include minor improvements to logging and documentation for clarity.

Accuracy Tag Feature for Behave Scenarios

• Added support for accuracy tags (e.g., @accuracy_80_10) in Behave scenarios to specify required accuracy percentage and number of retries for AI-based tests. Scenarios are automatically retried and marked as failed if the desired accuracy is not met. [1] [2]
• Updated documentation in docs/bdd_integration.rst and docs/ai_utils.rst to describe the usage and format of accuracy tags, including examples and integration details. [1] [2]
• Integrated accuracy tag patching into the Behave environment by calling patch_feature_scenarios_with_accuracy in the before_feature hook. [1] [2]

Testing and Logging Improvements

• Added unit tests for accuracy tag parsing and scenario patching in toolium/test/utils/ai_utils/test_accuracy.py.
• Improved logging in text similarity checks to separate similarity and explanation messages for better clarity.

Documentation Updates

• Updated the changelog to announce the new accuracy tag feature