Use builtin SerializeToElement/Deserialize over current json extensions

[ThomasCulotta]

Breaking change

Proposed change

Utilize JsonSerializer methods Deserialize and SerializeToElement added in .NET 6, to convert directly between objects and JsonElements rather than serializing out to strings first.

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
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• 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

[codecov-commenter]

Codecov Report

Merging #748 (1852a12) into dev (f6b3bc2) will decrease coverage by 0.04%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##              dev     #748      +/-   ##
==========================================
- Coverage   77.67%   77.62%   -0.05%     
==========================================
  Files         139      139              
  Lines        3624     3607      -17     
  Branches      367      365       -2     
==========================================
- Hits         2815     2800      -15     
  Misses        663      663              
+ Partials      146      144       -2     

Flag	Coverage Δ
unittests	77.62% <77.77%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/HassModel/NetDeamon.HassModel/Event.cs	88.88% <0.00%> (ø)
...l/NetDeamon.HassModel/Internal/ExtensionMethods.cs	100.00% <ø> (+7.69%)	⬆️
...sModel/NetDeamon.HassModel/Entities/EntityState.cs	84.61% <50.00%> (ø)
...on/HomeAssistant/Extensions/HassEventExtensions.cs	80.00% <100.00%> (ø)
...HassClient/Common/HomeAssistant/Model/HassState.cs	100.00% <100.00%> (ø)
...n.HassClient/Internal/Extensions/JsonExtensions.cs	75.00% <100.00%> (-9.62%)	⬇️
...mon.HassClient/Internal/HomeAssistantConnection.cs	87.06% <100.00%> (ø)

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[helto4real]

Love these kind of PR:s that removes code and do small optimizations!. Thanks alot!