Models method to generate a dict of its hyper-params (including wrapped)

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Feature Description

Method get_params for all RecTools models. It outputs a dict of all hyper-params available for tuning together with the values of the current instance. Wrapped models params are also added.

Why this feature?

This can be used in validation pipelines for easy-to-use integration with experiments trackers and metrics visualisation that is based on hyper-params.

Additional context

No response

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Cases for usage:

• save/load methods for models
• experiments tracking (mlflow, wandb, etc)
• cross_validate results go straight to MetricsApp