Integrate Module Loader into the shell

[BalassaMarton]

• Added the Module Loader to the Shell
• Implemented a simple Module Catalog (supporting only web modules)
• WebWindow now loads the preload scripts dynamically using script provider abstraction
• Moved startup logic to startup actions
• Revamped main window
• Removed the example manifest and added a new one to a dedicated examples folder

[codecov]

Codecov Report

Merging #382 (e12ce59) into main (caa3565) will decrease coverage by 1.80%.
The diff coverage is 4.65%.

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   76.86%   75.07%   -1.80%     
==========================================
  Files         173      177       +4     
  Lines        5564     5738     +174     
  Branches      233      233              
==========================================
+ Hits         4277     4308      +31     
- Misses       1286     1429     +143     
  Partials        1        1              

Files	Coverage Δ
...ng/dotnet/src/Client/Client/MessageRouterClient.cs	81.75% <100.00%> (+0.08%)	⬆️
...ng/dotnet/src/Server/Server/MessageRouterServer.cs	86.19% <ø> (ø)
...ModuleLoader.Abstractions/ModuleLoaderConstants.cs	100.00% <100.00%> (ø)
...UI.ModuleLoader.Abstractions/WebManifestDetails.cs	100.00% <100.00%> (ø)
....ModuleLoader.Abstractions/WebStartupProperties.cs	100.00% <100.00%> (ø)
...DependencyInjection/ServiceCollectionExtensions.cs	100.00% <ø> (ø)
...mposeUI.ModuleLoader/Runners/NativeModuleRunner.cs	33.33% <ø> (ø)
....ComposeUI.ModuleLoader/Runners/WebModuleRunner.cs	83.33% <100.00%> (ø)
src/shell/dotnet/Shell/Fdc3/Fdc3Options.cs	0.00% <ø> (ø)
src/shell/dotnet/Shell/WebWindow.xaml	0.00% <ø> (ø)
... and 12 more

... and 2 files with indirect coverage changes