Modify onnx.Cast(to:f16) to onnx.Cast(to:f32) #3229
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Add the rewrite to the decomposition pass under control of flag: --enable-force-f32-cast.
When a model is f16, we can use onnx tool to convert it to f32 for the interface, but not the cast op inside the model. This PR is a temporary workaround to blindly convert the onnx.Cast op. The change should be abandoned if a correct conversion is found.