[#3289] Android: Trigger onError callback on asset loading errors

[birdofpreyru]

Here is my PR for #3289:

• Avoids using the deprecated version of onReceivedError for onError implementation on Android.
• Fires onError callback, if provided, for asset loading errors, in addition to the primary source loading errors.
• Does not alter the logic of other related callbacks (onLoad, onLoadEnd, etc.); i.e. onError signals triggered for page assets do not prevent onLoad and onLoadEnd to be fired for the page itself, if that was loaded — thus, the page is signaled to have been loaded successfully, even if its assets failed to load, and that is just the original behavior of those signals before my PR.

Can we merge it, please? :)

[Titozzz]

Note to self: Maybe release as breaking as we will trigger more errors

[gmartpad]

When will these changes be added to a new version of react-native-webview? This might actually solve a problem where my page eternally loads because of assets failing to load, and onLoadEnd never triggers.

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