Put cifar10-distributed.py to intermediate folder

[vfdev-5]

Finalize moving tutorials into level-based folders:

• beginner
• intermediate

We have cifar10-distributed.py file that IMO should be put to intermediate folder near the notebook.
What to do:

• put the file into the folder
• update the notebook: https://github.com/pytorch-ignite/examples/blob/main/tutorials/intermediate/01-cifar10-distributed.ipynb
• rerun the notebook and make sure that everything is still working.

[miwojc]

i would like to work on it :)