Consider categorising the ChatOptions into Model and Request category of options

[tzolov]

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• For example the OllamaOptions class contains Ollama options properties as well as non-model related options such as format, model, keep-alive used for call request creation. Later are filtered out explicitly before the request is made.
• Similarly the Function Calling related properties are added to the corresponding ModelXOptions but marked as @JsonIgnore so they again are filtered before passing the options to the call. ...

A proper separation for model and request sub-category in the ModelXOptions would make the management cleaner and easier.