Resolve Hydra ListConfig objects

[RafayAK]

What does this PR do?

Resolves Hydra ListConfig objects so that dynamic inteploation works when printing config tree.
Also updated the example.yaml experiment to showcase the use.

Fixes #611

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.24%. Comparing base (bddbc24) to head (e0db27f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #612   +/-   ##
=======================================
  Coverage   83.24%   83.24%           
=======================================
  Files          11       11           
  Lines         376      376           
=======================================
  Hits          313      313           
  Misses         63       63           

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[RafayAK]

After the change suggested in this PR the printed config tree is correct and has the dynamic interploation for list items as well:

CONFIG
├── data
│   └── _target_: src.data.mnist_datamodule.MNISTDataModule                                                                                                                                        
│       ...                                                                                                                                                                   
│                                                                                                                                                                                                  
├── model
│   └── _target_: src.models.mnist_module.MNISTLitModule                                                                                                                                           
│       ...                                                                                                                                                                       
│                                                                                                                                                                                                  
├── callbacks
│   └── ...                                                                                                                              
│                                                                                                                                                                                                  
├── logger
│   └── wandb:                                                                                                                                                                                     
│         tags:                                                                                                                                                                                    
│         - mnist                                                                                                                                                                                  
│         - simple_dense_net                                                                                                                                                                       
│         - train                                                                                                                                                                                  
│         - batch_size_64                                                                                                                                                                          
│         group: mnist                                                                                                                                                                             
│       aim:                                                                                                                                                                                       
│         experiment: mnist                                                                                                                                                                        
│                                                                                                                                                                                                  
...
...                                                                                                                                                                        
├── tags
│   └── - mnist                                                                                                                                                                                    
│       - simple_dense_net                                                                                                                                                                         
│       - train                 # RESOLVED                                                                                                                                                           
│       - batch_size_64         # RESOLVED                                                                                                                                                                   
│                                                                                                                                                                                                  
...