feat: adds metadata and batch_index to batch_run

[edwinjosechittilappilly]

This pull request includes significant updates to the BatchRunComponent in the langflow package, adding new features and enhancing existing functionalities. It also includes updates to the related unit tests to ensure comprehensive test coverage.

Enhancements to BatchRunComponent:

• Added new input types BoolInput and MessageTextInput to BatchRunComponent and marked several inputs as required. (src/backend/base/langflow/components/helpers/batch_run.py) [1] [2] [3] [4]
• Updated the run_batch method to include metadata in the output DataFrame and handle errors gracefully. (src/backend/base/langflow/components/helpers/batch_run.py) [1] [2] [3]

Unit Test Updates:

• Added new test cases to cover scenarios with and without metadata, and to handle various error conditions. (src/backend/tests/unit/components/helpers/test_batch_run_component.py) [1] [2] [3]
• Minor formatting adjustments to ensure consistency and readability across test files. (src/backend/tests/unit/api/v1/test_api_schemas.py, src/backend/tests/unit/mock_language_model.py, src/backend/tests/unit/serialization/test_serialization.py, src/backend/tests/unit/test_schema.py) [1] [2] [3] [4]

[anovazzi1]

lgtm