Preserve onnx tensor dtype when inserting FIFOs #1192
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Before, the onnx tensor data type wasn't preserved and defaulted to float. While the FINN dtype was preserved (so no errors in the resulting hw), this could lead to errors for the executability of an onnx graph after the
InsertFIFOtransformation, see #1113This PR contains changes to keep the onnx tensor dtype when inserting FIFOs.