feat: add meshgrid coordinate grid creation - #24
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This PR adds
meshgrid()support for creating coordinate grids from one-dimensional vectors.Motivation and Context
Coordinate grids are useful for evaluating functions over a grid of points, building surface data, and preparing structured inputs for numerical workflows. This can be implemented safely using the existing shape and tiling operations without adding new FFI exports.
What's changed
NDArray::meshgrid()and the globalmeshgrid()helper withxy/ijindexing and sparse grid support.Breaking changes
None.