Target temp increment settings

Checklist

[X] I have filled out the template to the best of my ability.
[X] This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
[X] This issue is not a duplicate feature request of previous feature requests.

Is your feature request related to a problem? Please describe.

My thermostats only support 1degree increments for their targets, so the mapping from the group to the items can be a little off.

Describe the solution you'd like

Either add a setting to control the increment levels OR detect the increment levels supported by the items and automatically set the group to the most precise value among them. Bonus points for both as it would let users configure things to work how they want, but make things match the items out of the box.

Describe alternatives you've considered

None, just ignore it and know the temps will be set to the next degree up when on a .5.

Additional context

Recording 2024-02-09 121845

tetele / hvac_group