[IOS] Make MauiWebViewNavigationDelegate public methods virtual

[danielftz]

Description

I would like to have MauiWebViewNavigationDelegate public methods

public void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
public void DidFailNavigation(WKWebView webView, WKNavigation navigation, NSError error)
public void DidFailProvisionalNavigation(WKWebView webView, WKNavigation navigation, NSError error)
public void DecidePolicy(WKWebView webView, WKNavigationAction navigationAction, Action<WKNavigationActionPolicy> decisionHandler)

to be virtual, the same way they are in WKNavigationDelegate

Public API Changes

public virtual void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
public virtual void DidFailNavigation(WKWebView webView, WKNavigation navigation, NSError error)
public virtual void DidFailProvisionalNavigation(WKWebView webView, WKNavigation navigation, NSError error)
public virtual void DecidePolicy(WKWebView webView, WKNavigationAction navigationAction, Action<WKNavigationActionPolicy> decisionHandler)

Intended Use-Case

public override void DidFinishNavigation(WKWebView webView, WKNavigation navigation)
{
    base.DidFinishNavigation(webView, navigation);
}

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[maonaoda]

@jfversluis @Eilon It has been a long time. May I ask what the result of this proposal is? I don't think it should be a difficult thing.