Add default binding

[oeqqwq]

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[gemini-code-assist]

Summary of Changes

Hello @oeqqwq, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new add_default_binding function within the mplang kernel context. This function provides a programmatic way to define or modify the default mapping between operation types and their corresponding kernel implementations. This enhancement improves the flexibility and extensibility of the kernel system by allowing dynamic management of these bindings, complete with validation for kernel existence and optional override capabilities.

Highlights

• Export new function: The __all__ list in mplang/kernels/context.py has been updated to export the new add_default_binding function, making it part of the public API.
• Introduce binding function: A new function, add_default_binding, has been introduced. This function allows programmatic addition or modification of default kernel binding rules, mapping operation types to specific kernel IDs.
• Binding validation: The add_default_binding function includes validation to ensure the specified kernel_id is registered and prevents accidental overwrites of existing bindings without explicit override=True.

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[gemini-code-assist]

Code Review

This pull request introduces a new function add_default_binding to allow dynamically adding or overriding default kernel bindings. The implementation is clean, but there's a potential issue where built-in kernels might not be registered when add_default_binding is called, leading to an incorrect KeyError. I've suggested a fix to ensure all built-in kernels are imported and registered before checking for their existence.