💡 [REQUEST] - Tutorial on extending TorchX

### 🚀 Descirbe the improvement or the new tutorial

Create a better tutorial showing how to extend torchx.

### Existing tutorials on this topic

https://pytorch.org/torchx/latest/custom_components.html

### Additional context

_No response_

cc @msaroufim @svekars @carljparker @NicolasHug @kit1980 @subramen