Added UIScrollViewDelegate modifier to WebView #48
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I added a modifier to WebView to support UIScrollViewDelegate. I'm implementing WebUI with a custom toolbar and wanted to ensure the toolbar view hides when the user scrolls down and appears when they scroll up. This is my first contribution to someone else's project -- hope I got it right!
Allows the SwiftUI container / caller to set the WKWebView.scrollView.delegate with the modifier scrollViewDelegate(_:).