Add option to get any unhandled exception caught by the renderer

[egil]

Pull request description

Add option to get any unhandled exception caught by the renderer.

Closes #319.

PR meta checklist

• Pull request is targeted at DEV branch for code
  or targeted at main branch for documentation that is live on bunit.egilhansen.com.
• Pull request is linked to all related issues, if any.
• I have read the CONTRIBUTING.md document.

Code PR specific checklist

• My code follows the code style of this project and AspNetCore coding guidelines.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have updated the appropriate sub section in the CHANGELOG.md.
• I have added, updated or removed tests to according to my changes.
  • All tests passed.

[codecov]

Codecov Report

Merging #344 (202d4c9) into dev (41773b3) will increase coverage by 0.05%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##              dev     #344      +/-   ##
==========================================
+ Coverage   81.60%   81.66%   +0.05%     
==========================================
  Files         126      126              
  Lines        3805     3839      +34     
  Branches      491      495       +4     
==========================================
+ Hits         3105     3135      +30     
- Misses        541      544       +3     
- Partials      159      160       +1     

Impacted Files	Coverage Δ
...bunit.web/Extensions/RenderedFragmentExtensions.cs	69.23% <ø> (ø)
...Helpers/RenderedFragmentWaitForHelperExtensions.cs	62.50% <37.50%> (-4.17%)	⬇️
...it.core/Extensions/WaitForHelpers/WaitForHelper.cs	92.70% <100.00%> (+2.93%)	⬆️
src/bunit.core/Rendering/TestRenderer.cs	90.25% <100.00%> (+0.82%)	⬆️

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