feat(stablehlo): add shape inference for structural ops#67
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Implement InferStructuralShape for MatMul (2D and batched dot_general), Transpose (axis permutation), Reshape (element-count validated), Concat (axis concatenation), Slice (start/end indices), Gather (indices + slice sizes), and ReduceSum/ReduceMax/ReduceMean (with keepDims support). Separate file from shapes.go to avoid conflicts with T61.1.2.
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Phase 1 PJRT pipeline: shape inference for structural operations.