Support Tensor<bool> and Tensor<Int8> in C# API. Support Tensor<string> as input. Fix a bug in the InferenceSession Run() with RunOptions (#1671)
- Support bool-Tensor and int8-Tensor in input-output of C# api
- Support string-tensor as input in C# api
- Fix a bug in InferenceSession.Run() -- RunOptions was not passed into the native call