Updated chunker.py

[Ranjana761]

Summary

The improved implementation addresses several key issues and adds important features:

• Generic Type Support: Added proper generic type support using TypeVar, making the chunker work with any sequence type, not just text.
• Better Error Handling:
• Empty Input Handling: Properly handles empty input sequences by returning an empty list
• Improved Documentation:

[eric-anderson]

Going to close this after 2024-02-10 unless there is action on it.