feat(fdc3)- Add functionality for channel selector

[lilla28]

Changes:

• Added IModuleChannelSelector to be able to detect changes from both UI - when the user would like to joiin to a user channel, or from the API using the native, TypeScript clients
• Refactor channel management by replacing ChannelFactory and related interfaces with the new ChannelHandler abstraction across .NET and TypeScript codebases (Renamed internal classes of channel management).
• All async calls now use .ConfigureAwait(false).
• Update DesktopAgent, IntentsClient, and related classes to use ChannelHandler, and improve logging, error handling, and resource management.
• Update tests and public API surface to reflect new abstractions.
• Add documentation and README updates for channel selector integration.

[codecov]

Codecov Report

❌ Patch coverage is 83.25792% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.9%. Comparing base (9cf6822) to head (aad0a19).

Files with missing lines	Patch %	Lines
...t.Client/Infrastructure/Internal/ChannelHandler.cs	72.9%	9 Missing and 1 partial ⚠️
...oseUI.Fdc3.DesktopAgent/Fdc3DesktopAgentService.cs	88.0%	4 Missing and 2 partials ⚠️
...mposeUI.Fdc3.DesktopAgent/ModuleChannelSelector.cs	81.2%	6 Missing ⚠️
...Infrastructure/Internal/Protocol/PrivateChannel.cs	68.7%	5 Missing ⚠️
...nt/Infrastructure/Internal/UserChannelSetReader.cs	20.0%	4 Missing ⚠️
...pAgent.Client/Infrastructure/DesktopAgentClient.cs	90.9%	2 Missing and 1 partial ⚠️
.../Infrastructure/Internal/ResolverUICommunicator.cs	50.0%	2 Missing ⚠️
...topAgent/Infrastructure/Internal/IntentResolver.cs	50.0%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (83.2%) is below the target coverage (100.0%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1171     +/-   ##
=======================================
+ Coverage   65.8%   65.9%   +0.1%     
=======================================
  Files        334     335      +1     
  Lines       9755    9819     +64     
  Branches    1228    1289     +61     
=======================================
+ Hits        6421    6480     +59     
- Misses      2957    2964      +7     
+ Partials     377     375      -2     

Files with missing lines	Coverage Δ
...nt.Client/Infrastructure/Internal/IntentsClient.cs	92.8% <100.0%> (ø)
...Client/Infrastructure/Internal/Protocol/Channel.cs	96.0% <100.0%> (ø)
...frastructure/Internal/Protocol/IntentResolution.cs	98.0% <100.0%> (ø)
...opAgent.Shared/Contracts/JoinUserChannelRequest.cs	100.0% <ø> (ø)
...pAgent.Shared/Contracts/JoinUserChannelResponse.cs	100.0% <ø> (ø)
...Fdc3.DesktopAgent.Shared/Exceptions/ThrowHelper.cs	62.1% <100.0%> (+1.0%)	⬆️
....Fdc3.DesktopAgent.Shared/Fdc3StartupProperties.cs	100.0% <ø> (ø)
...ey.ComposeUI.Fdc3.DesktopAgent.Shared/Fdc3Topic.cs	93.7% <100.0%> (+0.2%)	⬆️
...DependencyInjection/ServiceCollectionExtensions.cs	100.0% <100.0%> (ø)
...y.ComposeUI.Fdc3.DesktopAgent/Fdc3StartupAction.cs	87.8% <100.0%> (ø)
... and 10 more

... and 3 files with indirect coverage changes

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