Feat: Support tool calls within reasoning

[Mushoz]

#6816 (comment)

This comment by @daniel-lxs mentions that the closed PR should be scoped differently, and it would be beneficial to create a generic solution to allow models to perform tool calls within their reasoning. I am currently using gpt-oss-120b, and it is constantly trying to perform tool calls within its reasoning and failing due to Roocode not supporting it.

I am opening this discussion so that hopefully Daniel's wonderful suggestion can be taken into account and hopefully implemented :)

[mikhailsal]

There may be a workaround if the model is asked to reason in a different tag that Roo cannot parse. Then the tool call might work.

[NaccOll]

You can try using #6744 and customize the package vsix for testing. It improves the tool calling of gpt-oss. But I think gpt-oss-20b and gpt-oss-120b are not suitable for programming.