Scroll end reached

I would like to know if there is a way to know, if scroll end is reached. So far i can't see anything quite like it. There is only `onScrollXChanged` and `onScrollYChanged` listeners. Other option for me is to get webview total inline content `height` and compare it to `onScrollYChanged` returned result.

Start by reviewing the existing onScrollXChanged and onScrollYChanged listeners in the plugin to understand how scroll events are exposed. Determine how a scroll-end signal could be exposed, then verify that consumers can reliably detect when the WebView reaches the end of its content.

Written by the indexing model from the issue text.