Use lazy for state value in StateChange

[Barsonax]

Breaking change

Proposed change

Use lazy for state value in StateChange. This solves a undefined JsonElement throwing a invalidoperation exception in tests.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• 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

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• The code compiles without warnings (code quality check)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration are added/changed:

• Documentation added/updated for http://netdaemon.xtz

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82%. Comparing base (6881467) to head (dc648bd).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...sModel/NetDeamon.HassModel/Entities/StateChange.cs	90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #1159   +/-   ##
====================================
  Coverage    82%     82%           
====================================
  Files       190     190           
  Lines      3781    3782    +1     
  Branches    425     423    -2     
====================================
+ Hits       3115    3116    +1     
  Misses      499     499           
  Partials    167     167           

Flag	Coverage Δ
unittests	82% <90%> (+<1%)	⬆️

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