Remove non-used eos_id in Python API

[rasbt]

The eos_id parameters was not used in the Python API. It can be removed because the eos_id is applied from the tokenizer directly. (It would be unreasonable for a user to know the eos_id because it's model dependent.)

[Andrei-Aksionov]

Don't forget to remove this line in the docstring too:

litgpt/litgpt/api.py

Line 217 in f80feff

eos_id: If specified, stop generating any more token once the <eos> token is triggered.