Dev/download hook

[sir1st-inc]

allow user add custom modelscope model func

[gemini-code-assist]

Summary of Changes

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This pull request introduces a significant extensibility feature by allowing users to define and register their own custom functions for fetching ModelScope models. This enhancement provides greater flexibility for integrating with diverse model sources or implementing specialized download behaviors, without requiring modifications to the core library. The change primarily involves adding a global hook mechanism and exposing functions to manage this hook, ensuring that the fetch_modelscope_model function can seamlessly incorporate user-defined logic.

Highlights

• Custom ModelScope Fetching Mechanism: A global registry (_CUSTOM_MODELSCOPE_FETCHER) has been implemented to allow external code to register a custom function that will be used for fetching ModelScope models.
• Public API for Custom Fetchers: Two new functions, register_fetch_modelscope_model and reset_fetch_modelscope_model, have been exposed in the public API, providing clear entry points for users to manage their custom ModelScope fetchers.
• Conditional Model Fetching Logic: The existing fetch_modelscope_model function now includes logic to check for a registered custom fetcher. If one is present, it will delegate the model download process to this custom function, ensuring extensibility.

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