[Hub apps] Refactor hub and app properties objects

[flanakin]

🛠️ Description

I'm not a fan of the config object structure I created for hub apps. This PR reorganizes the objects to mimic Azure resources but without the "properties" and creates a central place for deployment inputs called "options". App properties are separate and include a property for the hub config as well for easy referencing. I may split those at some point, but left it as-is for now.

This PR should not change anything. It's simply refactoring the object.

📋 Checklist

🔬 How did you test this change?

• 🤏 Lint tests
• 🤞 PS -WhatIf / az validate
• 👍 Manually deployed + verified
• 💪 Unit tests
• 🙌 Integration tests

🙋‍♀️ Do any of the following that apply?

• 🚨 This is a breaking change.
• 🤏 The change is less than 20 lines of code.

📑 Did you update docs/changelog.md?

• ✅ Updated changelog (required for dev PRs)
• ➡️ Will add log in a future PR (feature branch PRs only)
• ❎ Log not needed (small/internal change)

📖 Did you update documentation?

• ✅ Public docs in docs (required for dev)
• ✅ Internal dev docs in src (required for dev)
• ➡️ Will add docs in a future PR (feature branch PRs only)
• ❎ Docs not needed (small/internal change)