Summary

This PR adds direct attribute access to the FrameBuffer class by implementing an attribute handler in the C code. Users can now access the width, height, format, and stride properties directly from
framebuffer objects using standard attribute syntax (e.g., fb.width, fb.height, etc.).

This makes it easier to work with framebuffers in applications where these properties need to be accessed frequently, eliminating the need to store and track these values separately. It's particularly
useful when passing framebuffers between different functions or modules.

Prompted byhttps://github.com/orgs/micropython/discussions/17266

Testing

I've added a comprehensive test suite in tests/extmod/framebuf_attr.py that validates all the framebuffer attributes with all supported formats:

• MONO_VLSB, MONO_HLSB, MONO_HMSB
• RGB565
• GS2_HMSB, GS4_HMSB, GS8

The test also checks various dimensions (8x4, 16x8, 128x64) and verifies that attempting to access non-existent attributes raises an AttributeError as expected.

The implementation was tested on the Unix port, and since this change is contained within the framebuf module and doesn't interact with hardware-specific features, it should work consistently across all
ports that support the framebuf module.

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