Use EntityDescription - rainmachine

[cdce8p]

Proposed change

Update rainmachine to use EntityDescription for sensor metadata.
-> #53201

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.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

[probot-home-assistant]

Hey there @bachya, mind taking a look at this pull request as it has been labeled with an integration (rainmachine) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[bachya]

I'm not as familiar with the architecture rationale for this change, so I'll leave that to someone else. Functionally, the integration works fine with this change. 👍🏻

[bdraco]

Tested on a production install 👍

[cdce8p]

Thank you both for testing it!