[BUG] <title> Will torchsparse++ support conv2d?

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

As described in title: Will torchsparse++ support conv2d?

### Expected Behavior

_No response_

### Environment

```markdown
- GCC:
- NVCC:
- PyTorch:
- PyTorch CUDA:
- TorchSparse:
```


### Anything else?

_No response_