add generic RxAppMock

[makp0]

Breaking change

Proposed change

Make RxAppMock generic to allow testing against interfaces inherited from INetDaemonRxApp

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 doesn't modify the original RxAppMock. Just makes it generic

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

[helto4real]

Looks good. Fix the errors and warnings in the CI and all is golden. Thanks!

[codecov-commenter]

Codecov Report

Merging #433 (5e54c7c) into dev (491324c) will decrease coverage by 0.20%.
The diff coverage is 80.35%.

@@            Coverage Diff             @@
##              dev     #433      +/-   ##
==========================================
- Coverage   54.57%   54.37%   -0.21%     
==========================================
  Files          82       83       +1     
  Lines        4621     4616       -5     
  Branches      714      714              
==========================================
- Hits         2522     2510      -12     
- Misses       1871     1874       +3     
- Partials      228      232       +4     

Flag	Coverage Δ
unittests	54.37% <80.35%> (-0.21%)	⬇️

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

Impacted Files	Coverage Δ
src/Fakes/NetDaemon.Fakes/RxAppMock[T].cs	79.79% <79.79%> (ø)
src/App/NetDaemon.App/Common/ExtensionMethods.cs	80.76% <100.00%> (+1.17%)	⬆️
src/Fakes/NetDaemon.Fakes/ReactiveEventMock.cs	100.00% <100.00%> (ø)
...pp/NetDaemon.App/Common/Reactive/NetDaemonRxApp.cs	82.55% <0.00%> (-1.71%)	⬇️
...rc/Daemon/NetDaemon.Daemon/Daemon/NetDaemonHost.cs	53.36% <0.00%> (-0.39%)	⬇️

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