Adds a new configuration option `chat_template` to the Llama.cpp extension, allowing users to define a custom Jinja chat template for the model.
The template can be provided via a new input field in the settings, and if set, it will be passed to the Llama.cpp backend using the `--chat-template` argument. This enhances flexibility for users who require specific chat formatting beyond the GGUF default.
The `chat_template` is added to the `LlamacppConfig` type and conditionally pushed to the command arguments if it's provided. The placeholder text provides an example of a Jinja template structure.
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