Support JSON Outputs with json and Wrappers

[xiaobin-noss]

Hi, this project is amazing!
I have a small request regarding JSON handling. It's becoming increasingly common for JSON outputs generated by LLMs (such as GPT or Claude) to include wrappers like json at the beginning or at the end.

Would it be possible to enhance the tool to handle these cases directly? If needed, I’d be happy to help submit a PR for this feature.

[josdejong]

Ah, that is a nice one, thanks for your suggestion. Yes I think we can handle stripping code block backticks.

A PR would be welcome, thanks for the offer :)

[Suixinlei]

This is my PR, sorry that the issue was raised by my work account, I can't submit a PR using that account.

#138