add tutorial on multi node search on azure

[lovettchris]

Pull Request Template

this PR cannot yet be merged until the Azure ML SDK version 1.5.0 goes live, it was supposed to go out yesterday, but they are stuck on a test failure, should be out shortly.

Description

This notebook and accompanying code shows how to run an Archai Network Architecture Search (NAS) using an Azure Machine Learning Workspace with partial training of models on a GPU cluster providing validation accuracies to guide that search.

This PR replaces https://github.com/microsoft/archai/pull/179

Fixes: # (issue)

Changes

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (causes existing functionality to not work as expected)
• [ ] Documentation update

Configuration:

• Archai version:
• Environment:
• OS:

Final checks:

• [x] Follows guidelines of project
• [x] Self-review of code
• [x] Commented code in hard-to-understand areas
• [x] Corresponding changes to the documentation
• [x] Changes generate no new warnings
• [x] Dependent changes have already been merged
• [x] Checked code correction any misspellings

[lovettchris]

@piero2c , @sytelus - ok, I've resolved the comments, but the PR cannot yet be merged until the Azure ML SDK version 1.5.0 goes live, it was supposed to go out yesterday, but they are stuck on a test failure, should be out shortly.