Use websockets

[ludeeus]

Breaking change

Proposed change

• Uses WebSockets for API calls where we can.
• Adds event listener so the Supervisor can signal updates to the frontend.
• Extends atLeastVersion to check 3 sections

Needing to keep backward compatibility sucks...

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 supervisor.snapshots complains about double snapshot request #8332
• This PR is related to issue or discussion:
• Link to documentation pull request:

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

no longer valid