Prototype unified api

### 🚀 The feature, motivation and pitch

Want to try having a shared api for ET Desktop between ET runtime and NativeRT. 

Can start with just a shared tensor and module api. 

Try and get NativeRT symbols from libtorch.so from the pip install

### Alternatives

_No response_

### Additional context

_No response_

### RFC (Optional)

_No response_

cc @larryliu0820 @lucylq