Improve CLI based on Feedback

[jordlay]

PR includes:

• adding meaningful logs
• error handling for not providing parameters in ARM template
• preventing auto overwriting of input.json
• adding clarifying comments to help text
• convert vnf types in schema

---

This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.

[jddarby]

Are we satisfying the azdev style command after this PR?