Save kwargs for huggingface TGI model

[GuyAglionby]

Previously, using HFClientTGI with BootstrapFewShot didn't work for max_rounds > 1. The culprit was:

File "<snip>/lib/python3.10/site-packages/dsp/modules/lm.py", line 84, in copy
    model = kwargs.pop('model')
KeyError: 'model'

This PR makes sure the relevant kwargs are saved (all are necessary)

Thanks!

[darinkishore]

@okhat if this PR could be reviewed and merged would be amazing :)

[janpf]

Same issue for OllamaLocal(LM), but just saving it to kwargs messes with the copy function of the LM class.

[arnavsinghvi11]

Thanks @GuyAglionby ! just following up on old PRs :)