Fix visual observation tensor indexing for Unity inference #6239
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This change corrects the tensor indexing calculation in TensorExtensions.Index() to properly support CHW (channels-height-width) format used by both Unity's observation writers and ONNX models during inference.
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Summary
Problem
The indexing formula was calculating HWC layout while Unity's visual sensors write data in CHW format.
Solution
Corrected TensorExtensions.Index() to properly calculate CHW tensor indices that match Unity's observation writer
format.