Move all entity methods to the IEntityCore interface

[x00Pavel]

Breaking change

Proposed change

All methods and class attributes are moved to IEntityCore interface to have ability for external libraries access these methods and attributes

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 Entity methods are no accessable in external libraries via interfaces #943
• 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

[FrankBakkerNl]

These methods were deliberately not added to this interface

[FrankBakkerNl]

This was intended

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e3a8726) 80.10% compared to head (91d03ad) 80.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #944      +/-   ##
==========================================
- Coverage   80.10%   80.04%   -0.06%     
==========================================
  Files         174      174              
  Lines        3443     3443              
  Branches      441      441              
==========================================
- Hits         2758     2756       -2     
- Misses        502      503       +1     
- Partials      183      184       +1     

Flag	Coverage Δ
unittests	80.04% <ø> (-0.06%)	⬇️

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

Files	Coverage Δ
...c/HassModel/NetDeamon.HassModel/Entities/Entity.cs	81.25% <ø> (ø)

... and 1 file with indirect coverage changes

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