[FPGADataflow] Fix InferChannelwiseLinearLayer. Correct output datatype inference from idt and parameters. Add parameter type inference. Check parameter shape. Check if retrived intializer is None (dynamic input)

[HLSCustomOp] Add paramDataType attribute for the user to control the parameter datatype and be able to visualize it once the op is infered

plus a small bugfix (break -> continue)

added dt inference to test case

[Transform] Modify InferDataTypes so that if output datatype for std onnx nodes is already set, it is not changed