feat(Shell): Add FDC3 ChannelSelector

[kruplm]

This PR introduces a new UI element that allows users to select the FDC3 Channel.
The ChannelSelector is leveraging WPF Material Design PopupBox, and rendered as an overlay thanks to the new WebView2CompositionControl which solves the AirSpace Issue

Changes in this PR

• The Embedded WebBrowser is using WebView2CompositionControl as a drop-in replacement for the WebView2 Control. As this is using Direct3D under the hood the target framework had to be changed to net8.0-windows10.0.17763.0
• We register a communication channel for each instance dynamically so that each web module can be notified by it's channel selector control about the channel change and vice-versa.
• Fdc3ChannelSelectorStartupAction: the control is only added to the DOM if FDC3 is enabled.