Fix missing imports (1 of 2)

[steverep]

Proposed change

Fixes about half of the 57 missing import errors from lit-analyzer. Sorted imports in files modified, and removed an unused import from valve control.

We need a rule for no-unused-imports too 🤷🏻‍♂️

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 #
• 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

[steverep]

runem/lit-analyzer#348