Set request params per model settings in recipe

**Please explain the motivation behind the feature request.**
Right now one can only customize [temperature](https://github.com/aaif-goose/goose/blob/main/crates/goose/src/recipe/mod.rs#L107) for model responsible for driving recipe. There is no way to set however `reasoning_effort` or other (like `top_k` or `top_p` for open weights models) params. There is benefit in tweaking those per-recipe instead of going with global `GOOSE_PREDEFINED_MODELS`, as various recipes might benefit from different model tuning.

**Describe the solution you'd like**
Ideally model settings in recipe accept `request_params`.
From what I see that could be plugged in goose-clii [there](https://github.com/aaif-goose/goose/blob/main/crates/goose-cli/src/session/builder.rs#L232-L292).

**Describe alternatives you've considered**
One can workaround current limitation with having proxy between goose and provider(s) to provide model aliases so that via `GOOSE_PREDEFINED_MODELS` (or proxy alone) one could map those tweaks uniquely. That is however cumbersome and as far as understand will not work with ACP providers.

- [x] I have verified this does not duplicate an existing feature request

The issue points to crates/goose/src/recipe/mod.rs for the current temperature setting and crates/goose-cli/src/session/builder.rs for where request_params could be integrated. Start by examining the ModelSettings struct in the recipe module to add a request_params field. Then, follow the builder pattern in session/builder.rs to propagate these params to the model request. Check for existing tests around model configuration to ensure compatibility.

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