[WIP] Add NCNN MicroPython C API Bindings

[inspireMeNow]

This pull request adds MicroPython bindings for the NCNN C API, enabling developers to run NCNN neural network inference directly within MicroPython environments.

Changes:

• Introduced a new micropython/c_api directory containing the binding source files.

• Wrapped core NCNN functionalities (e.g., model loading, extractor creation) with MicroPython C extension functions.

• Defined MicroPython objects and their methods to make the NCNN API easy to use like regular Python code.

• Added instructions for compiling the bindings on supported platforms.

• Included example scripts demonstrating how to load a model and run inference in MicroPython.

[tencent-adm]

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[github-actions]

The binary size change of libncnn.so (bytes)

architecture	base size	pr size	difference
x86_64	15648008	15648008	0 😘
armhf	6649020	6649020	0 😘
aarch64	9987736	9987736	0 😘