Add Implicit Autoencoder for Point Cloud Self-supervised Representation Learning

**Is your feature request related to a problem? Please describe.**
No

**Describe the solution you'd like**
Add Implicit AutoEncoder architecture

**Describe alternatives you've considered**
Building the pipeline myself. But I think that you've done such a good job building this tool, I believe that it can be a good addition for it.

**Additional context**
N/A
