Add chunking option (needs to be implemented per-language) for larger files

[mrseanryan]

Add chunking option (needs to be implemented per-language) for larger files

Initially, only support .py files - other files should raise an exception.

[mrseanryan]

related: Python to count tokens = https://cookbook.openai.com/examples/how_to_count_tokens_with_tiktoken

[mrseanryan]

DONE:

• Also can output json with function-first-line and comment - so saving tokens.