Refactor deserialize_chat_template

[Jeadie]

Changes

• The macro deserialize_chat_template returns two objects ChatTemplate and GenerationConfig.
• These two objects are independent when instantiating from a impl ModelPaths.
• Create new function to create ChatTemplate
• Creating a GenerationConfig is a one liner, no function needed.
• Also, fixed some documentation.

[github-actions]

Code Metrics Report

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[Jeadie]

The current implementation of load_model_from_path uses the chat_template from the get_template_filename regardless if the Loader has been instantiated with a chat_template: Option<String> override (e.g. GGUFLoader.

I think the correct behaviour should be that if the use has provided a specific chat_template, use it instead of the one derived from get_template_filename.

[EricLBuehler]

Looks great, thanks!