UICatalog scenario to open another scenario process and return some result

[BDisp]

Fixes

• Fixes #_____

Proposed Changes/Todos

• Add two scenarios which one open a child scenario in another process which return some result back to the caller scenario.

Pull Request checklist:

• I've named my PR in the form of "Fixes #issue. Terse description."
• My code follows the style guidelines of Terminal.Gui - if you use Visual Studio, hit CTRL-K-D to automatically reformat your files before committing.
• My code follows the Terminal.Gui library design guidelines
• I ran dotnet test before commit
• I have made corresponding changes to the API documentation (using /// style comments)
• My changes generate no new warnings
• I have checked my code and corrected any poor grammar or misspellings
• I conducted basic QA to assure all features are working

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.10%. Comparing base (b9f55a5) to head (26951e2).

Additional details and impacted files

@@               Coverage Diff               @@
##           v2_develop    #4418       +/-   ##
===============================================
+ Coverage       64.85%   77.10%   +12.24%     
===============================================
  Files             388      388               
  Lines           44984    44984               
  Branches         6343     6343               
===============================================
+ Hits            29176    34685     +5509     
+ Misses          13894     8401     -5493     
+ Partials         1914     1898       -16     

see 164 files with indirect coverage changes

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