[MIGraphX EP] Link FP4 types between OnnxRT and MIGraphX APIs #26231
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Do this so that MIGraphX can take in fp4 types from input/output tensors and then use that to perform an inference via the MIGraphX API.
Description
Mirroed changes going into ROCm 7.1 build. Cherry -picked mainline OnnxRT changes to get fp4 tensor support before adding this ontop.
Moving this to mainline OnnxRt to enable the MIGraphX EP to allow for fp4 input/output tensors
ROCm#176
Motivation and Context
Add fp4 support to MIGraphX EP