fix(windows): enable use of custom protocols for all request source kinds when new enough. #1491
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WebView2 introduced the ability to handle WebResourceRequests for specific Sources. This includes Shared Workers and iframes. This change allows us to handle requests to custom protocols in WebView2 that support the new method while falling back to the old method if the newer interface is not implemented.
The method exists as of WebView2 1.0.2365.46+ (April 2024 version)
See MicrosoftEdge/WebView2Feedback#1114 and https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2_22?view=webview2-1.0.2420.47
Potentially closes #949