Fix: StateHasChanged firing before render being available in Blazor

[glennawatson]

What kind of change does this PR introduce?

fix

What is the current behavior?

There is a exception that happens when the ViewModel is changed, because the render hasn't happened yet.

What is the new behavior?

We fire the StateHasChanged in a InvokeAsync, which will dispatch it after the render.

What might this PR break?
Hopefully no-one.

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Merging #2334 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2334   +/-   ##
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  Coverage   54.73%   54.73%           
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  Files         113      113           
  Lines        4334     4334           
  Branches      660      660           
=======================================
  Hits         2372     2372           
  Misses       1797     1797           
  Partials      165      165

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