feat(fdc3) - Add leftover FDC3 native client implementation

[lilla28]

Implemented

• GetUserChannels
• FindIntent
• GetOrCreateChannel
• FindInstances
• FindIntentsByContext
• RaiseIntentForContext
• RaiseIntent
• AddIntentListener
• Open
• CreatePrivateChannel

[codecov]

Codecov Report

❌ Patch coverage is 66.92776% with 380 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.8%. Comparing base (64b13ac) to head (971b370).
⚠️ Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
...Infrastructure/Internal/Protocol/PrivateChannel.cs	51.0%	89 Missing and 23 partials ⚠️
...estHelpers/DesktopAgentClientConsoleApp/Program.cs	0.0%	77 Missing ⚠️
...t.Client/Infrastructure/Internal/IntentListener.cs	65.3%	31 Missing and 12 partials ⚠️
...pAgent.Client/Infrastructure/DesktopAgentClient.cs	63.3%	21 Missing and 12 partials ⚠️
...rnal/PrivateChannelContextListenerEventListener.cs	29.0%	21 Missing and 1 partial ⚠️
.../Internal/PrivateChannelDisconnectEventListener.cs	30.0%	20 Missing and 1 partial ⚠️
...oseUI.Fdc3.DesktopAgent/Fdc3DesktopAgentService.cs	36.6%	16 Missing and 3 partials ⚠️
....Client/Infrastructure/Internal/ContextListener.cs	37.9%	13 Missing and 5 partials ⚠️
...nt.Client/Infrastructure/Internal/IntentsClient.cs	92.8%	5 Missing and 6 partials ⚠️
...t.Client/Infrastructure/Internal/ChannelFactory.cs	93.3%	6 Missing and 3 partials ⚠️
... and 6 more

❌ Your patch status has failed because the patch coverage (66.9%) 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   #1114     +/-   ##
=======================================
+ Coverage   64.3%   65.8%   +1.4%     
=======================================
  Files        325     334      +9     
  Lines       8681    9761   +1080     
  Branches    1102    1229    +127     
=======================================
+ Hits        5587    6427    +840     
- Misses      2781    2957    +176     
- Partials     313     377     +64     

Files with missing lines	Coverage Δ
...DependencyInjection/ServiceCollectionExtensions.cs	100.0% <100.0%> (ø)
...t.Client/Infrastructure/Internal/MetadataClient.cs	94.8% <100.0%> (+1.9%)	⬆️
...Client/Infrastructure/Internal/Protocol/Channel.cs	96.0% <100.0%> (ø)
...ternal/Protocol/PrivateChannelInternalEventType.cs	100.0% <100.0%> (ø)
...topAgent.Shared/Converters/ContextJsonConverter.cs	100.0% <ø> (ø)
...pAgent.Shared/Converters/ValuationJsonConverter.cs	100.0% <100.0%> (ø)
....Fdc3.DesktopAgent.Shared/Fdc3StartupParameters.cs	100.0% <ø> (ø)
...dc3.DesktopAgent.Shared/SerializerOptionsHelper.cs	100.0% <100.0%> (ø)
...DependencyInjection/ServiceCollectionExtensions.cs	100.0% <100.0%> (ø)
....ComposeUI.Fdc3.DesktopAgent/Fdc3ShutdownAction.cs	68.0% <100.0%> (ø)
... and 20 more

... and 12 files with indirect coverage changes

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