Is your feature request related to a problem? Please describe.
I am using Onnx Runtime library and expecting it to have full Onnx support as it promises. But some data types for some operators are turned off as discussed in #1080. Right now it is inconvenient to ensure that the Onnx Runtime library has all Onnx operators enabled, as I need to do something similar to 31cbb5d and then rebuild to support some data types.

System information

• ONNX Runtime version (you are using): 0.4.0

Describe the solution you'd like
I am looking for a build option/mode so that I can build the library with full Onnx support. If the option/mode is not set, then the library will fall back to the current setting.