Ensure consistent number display for gauge

[spacegaier]

Breaking change

Proposed change

Currently the entity state is converted to a Number which means that integers loose their decimal. That leads to inconsistent number formatting/rendering, since e.g. entity card or entity-row use the state directly as input for the global number formatting logic.

With this PR the conversion to Number is kept only for the NaN checks, but the gauge itself gets the original state value.

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 Missing 0(s) after decimal point  #7787
• 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