add kimi tool parser

[Evanev7]

Adds a tool parser based on the glm47 and vllm tool parser. Some points of note:

• Kimi-K2 has a <|start_tool_calls_section|> in which it makes multiple calls. I don't handle this, and I don't think the rest of the code intends to, but would a follow up PR aiming to address this kind of parallel tool calling be appreciated? I'm not sure how much you want PRs making larger changes to the repo.
• I couldn't actually get the loading logic correct with the full kimi-k2. I tested the parsing code manually with some custom ignores for the calls section, but the loading might need to change.

[awni]

Looks great. Could you please add a test here https://github.com/ml-explore/mlx-lm/blob/main/tests/test_tool_parsing.py ?

[awni]

LGTM!