Generic Thermostat Add Target Min Max to UI config

[hughsaunders]

Breaking change

This PR doesn't not introduce a breaking change

Proposed change

Currently you can configure the minium and maximum target temperatures if you create a generic thermostat in YAML. If you create it via the UI, there is no option to configure them, you just get the climate domain defaults.

This commit adds minimum and maximum fields to the first stage of the generic thermostat config flow, so that UI users can also set min and max.

Min and max are important as usually users want to select target temperatures within a relatively narrow band, while the defaults create a wide band. The wide band makes it hard to be accurate enough with the arc style temperatue selector on the thermostat card.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

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1. Add PARALLEL_UPDATES = 0 to Reolink platforms #131165 (review)
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