fix: data type imports and typing

[briangreunke]

Generated Summary:

• Updated import handling in several modules to improve error messages for missing dependencies.
• Introduced a check_imports function in image.py and table.py to raise informative errors if required packages (PIL, NumPy, Pandas) are not installed.
• Consolidated import error message generation into a new utility function, generate_import_error_msg, for better maintainability.
• Changed the way some libraries are imported, utilizing lazy imports within their respective functions to optimize performance and reduce initial load time.
• Modified the pyproject.toml to include a new dependency on datasets and made minor adjustments to the training dependencies.
• Overall, these changes enhance the robustness of the package and provide clearer guidance to users regarding missing dependencies.

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