Finetuning Starcoder2 for python copilot

[Exorust]

What does this PR do?

This adds a new article on how to finetune starcoder2 for a python copilot

At the moment, please tag @MKhalusova

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[MKhalusova]

Hi @Exorust! Thank you for your contribution. We already have a notebook in the cookbook on fine-tuning the StarCoder model on custom code - https://huggingface.co/learn/cookbook/fine_tuning_code_llm_on_single_gpu

How is the notebook that you are adding different from it?