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VideoPlane.__dlpack__() only handled nv12/p010le/p016le and raised NotImplementedError otherwise, so common CPU formats (packed RGB, planar YUV, gray, ...) needed a NumPy intermediate to export. Add a generic CPU path that describes the plane from its pixel-format descriptor: single-component planes export as 2D (H, W), planes that interleave components as 3D (H, W, C). This reproduces the existing nv12/p010le/p016le layouts exactly. Bitstream, palette, Bayer, big-endian 16-bit, and sub-byte packings are rejected; CUDA export is unchanged. Fixes #2217
VideoFrame.from_dlpack() still only accepted the 2-plane nv12 family, so a decoded yuv420p frame could not be rebuilt from the plane tensors the previous commit can now export. Add a zero-copy CPU path for planar formats whose planes each hold a single component: yuv420p/yuv422p/yuv444p, gray, gbrp, and their 16-bit little-endian variants. Plane count, per-plane shape, and chroma subsampling come from the pixel-format descriptor. Continues #2217
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