[DO NOT MERGE] FEAT: Support transformers tool call

[codingl2k1]

A demo that implements tool calls for mistral-instruct-v0.3.

• Requires the main version transformers (the feature has not been released): https://github.com/huggingface/transformers
• Requires branch 35 of Mistral-7B-Instruct-v0.3 (not merged yet): https://huggingface.co/mistralai/Mistral-7B-Instruct-v0.3/discussions/35

Reference: https://huggingface.co/docs/transformers/main/en/chat_templating#advanced-tool-use--function-calling

[qinxuye]

There are conflicts, when this PR is ready for review, please ping me.