Adding dask-clouprovider multi-GPU multi-node example using RAPIDS

example: dask-cloudprovider mnmg
description: Setting up Cluster on Azure with dask-cloudprovider and running a RAPIDS model.

## Additional context
This is the example already in RAPIDS repo: https://github.com/rapidsai/cloud-ml-examples/blob/main/azure/notebooks/azure_mnmg.ipynb

cc: @zronaghi

Start by reading the referenced RAPIDS notebook, azure_mnmg.ipynb, and compare its Azure, dask-cloudprovider, and RAPIDS setup with the examples in this repository. Done means the multi-GPU, multi-node Azure example is added in the appropriate example location and can be followed to set up the cluster and run the model.

Written by the indexing model from the issue text.