Add live camera & custom AR to Area card

[karwosts]

Proposed change

Allow area card to use live camera stream like the other picture type cards can do.

Can't think of any reason not to allow this.

Also allow a custom aspect ratio for area card, in case the camera stream does not fit nicely for 16:9.

Type of change

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

Example configuration

Additional information

• This PR fixes or closes issue: fixes Lovelace Area Card - Show live view as background not woring #12048
• This PR is related to issue or discussion:
• Link to documentation pull request: Document proposed new area card features (camera_view and aspect_ratio) home-assistant.io#29818

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[bramkragten]

This should be added to the type AreaCardConfig

And should probably also be added to the editor and struct?

[karwosts]

I'm happy to update the UI editor to include these if desired, just wanted to check that this option was approved before doing so.

[karwosts]

Updated the editor. camera_view field is conditionally shown if show_camera is enabled. I also realized that aspect ratio was not respected for area cards without an image or camera, I so fixed area card to support that.