Bind mlx_contiguous and _mlx_array_is_row_contiguous from mlx-c.
Floats(), DataInt32(), and Ints() now automatically handle non-contiguous
arrays (from Transpose, BroadcastTo, SliceAxis, etc.) by checking
IsRowContiguous() and making a contiguous copy when needed.
Previously these methods returned silently wrong data for view arrays.
The old workaround of Reshape(arr, totalSize) is no longer needed.
7 new tests for contiguous handling (transpose, broadcast, slice views).
Co-Authored-By: Virgil <virgil@lethean.io>
Move foundation CGO files from root package to internal/metal/ package.
Changes package declaration from `package mlx` to `package metal`.
Updates CGO SRCDIR paths to account for new location (two levels deeper).
Extracts go:generate directives into root generate.go.
Co-Authored-By: Virgil <virgil@lethean.io>
