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* feat(tests): add integration tests for conditional imports in modules

- Introduced a new test suite to validate that integration modules handle optional dependencies correctly.
- Ensured modules can be imported when dependencies are missing and provide helpful error messages.
- Verified that all integration modules exist and can be imported when dependencies are available.
- Implemented comprehensive checks for availability flags and graceful import handling.
- This addition prevents regressions in conditional import handling across all integrations.

* feat(tracer): enhance conditional imports and type hinting for Anthropic integration

- Implemented conditional import handling for the `anthropic` library, allowing for graceful degradation when the library is not installed.
- Added type hints for `anthropic` types using forward references to improve code clarity and maintainability.
- Introduced an informative error message when the `anthropic` library is missing, guiding users on how to install it.
- This update ensures better compatibility and user experience when working with optional dependencies in the Anthropic integration.

* feat(tracer): improve conditional imports and type hinting for OpenAI integration

- Implemented conditional import handling for the `openai` library, allowing for graceful degradation when the library is not installed.
- Enhanced type hints using forward references for `openai` types to improve code clarity and maintainability.
- Introduced informative error messages when the `openai` library is missing, guiding users on how to install it.
- This update ensures better compatibility and user experience when working with optional dependencies in the OpenAI integration.

* feat(tracer): enhance conditional imports and type hinting for Mistral integration

- Implemented conditional import handling for the `mistralai` library, allowing for graceful degradation when the library is not installed.
- Improved type hints using forward references for `mistralai` types to enhance code clarity and maintainability.
- Introduced an informative error message when the `mistralai` library is missing, guiding users on how to install it.
- This update ensures better compatibility and user experience when working with optional dependencies in the Mistral integration.

* feat(tracer): enhance conditional imports and type hinting for Groq integration

- Implemented conditional import handling for the `groq` library, allowing for graceful degradation when the library is not installed.
- Improved type hints using forward references for `groq` types to enhance code clarity and maintainability.
- Introduced an informative error message when the `groq` library is missing, guiding users on how to install it.
- This update ensures better compatibility and user experience when working with optional dependencies in the Groq integration.

* feat(tracer): enhance conditional imports and type hinting for OpenAI integration

- Improved conditional import handling for the `openai` library, ensuring graceful degradation when the library is not installed.
- Enhanced type hints using forward references for `openai` types to improve code clarity and maintainability.
- Added an informative error message when the `openai` library is missing, guiding users on how to install it.
- This update ensures better compatibility and user experience when working with optional dependencies in the OpenAI integration.

* feat(langchain): enhance conditional imports and type hinting for LangChain integration

- Implemented conditional import handling for the `langchain` library, allowing for graceful degradation when the library is not installed.
- Improved type hints using forward references for `langchain` types to enhance code clarity and maintainability.
- Introduced an informative error message when the `langchain` library is missing, guiding users on how to install it.
- This update ensures better compatibility and user experience when working with optional dependencies in the LangChain integration.

* fix(tests): improve exception handling in integration test for conditional imports

- Enhanced exception handling in the `run_integration_test` function by specifying `FileNotFoundError` and `OSError` in the exception clause, ensuring more precise error management.
- This update prevents potential silent failures when attempting to unlink temporary files, improving the robustness of the integration tests for conditional imports.