upgrade to PTL 1.7
Signed-off-by: nithinraok <nithinrao.koluguri@gmail.com>

# What does this PR do?

Upgrade PTL version to 1.7.2 

**Collection**: All

# Changelog 

-  Default max_steps is -1 now instead of None  
-  DDPPlugin has been moved from plugins to strategies and renamed as DDPStrategy -> renamed NLPDDPPlugin to NLPDDPStrategy
- override lightning module trainer property  to make it compatible with our existing models, since it's been removed from PTL 1.7 
- Following args have been removed from Trainer 

> - prepare_data_per_node
> - checkpoint_callback - replaced with enable_checkpointing
> - process_position - now part of TQDMprogressbar callback
> - stochastic_weight_avg - now part of callback
> - flush_logs_every_n_steps
> - weights_summary - replaced with callback
> - terminate_on_nan
> - log_gpu_memory - part of DeviceGPUStats callback
> - Progressbar refresh rate - part of TQDMProgressbar callback

TODO:
- [x] remove Cuda override function, once https://github.com/Lightning-AI/lightning/pull/14128 was released as part of 1.7.2 

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- [x] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [x] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [x] New Feature
- [x] Bugfix
- [x] Documentation