[QNN EP] Handle 0-dim tensor for Concat.

[minfhong-qti]

Description

Define a util function IsNullNodeUnitIODef to check whether given tensor has 0-dim in shape. To restrict the impact, current implementation only skip constructing such tensor for Concat.

Motivation and Context

There may exsit tensor with 0-dim in shape, especially for Concat's inputs. Such null inputs often exist in models saved from PyTorch. Since QNN could not execute empty tensors, they must be explicitly handled.

[edgchen1]

/azp run Linux QNN CI Pipeline,Win_TRT_Minimal_CUDA_Test_CI,Windows ARM64 QNN CI Pipeline,Windows GPU Doc Gen CI Pipeline

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