Simplify vizio unique ID check since only IP and device class are needed

[raman325]

Proposed change

When I originally implemented config_flow, I was under the impression that I needed an auth token before I can get the unique_id of a vizio device. I recently discovered that I only actually need the host and device_class to get the unique_id which means I can set it much earlier and detect for a duplicate sooner. As a result, I can remove duplicate logic and slightly simplify the config flow. I also added two missing typehints that I found and fixed some other typehints that pylance found errors for.

EDIT: The update to pyvizio was to remove the auth token as a parameter from the get_unique_id function.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Checklist

• The code change is tested and works locally.
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