Improve the WebView example for NativeScript Angular (SDK examples)

[tsonevn]

Adding an example for the WebView component inside the NS Angular part of the docs, which shows how to use gestures. Similar to the example from the non-Angular part of docs - https://docs.nativescript.org/cookbook/ui/web-view#using-webview-with-gestures

Reported via the documentation feedback form

[pedromorgan]

add tabs to switch between js/ts/ns/vue/NEXT ;-)

[tjvantoll]

Here’s a link to the ng version for reference: https://docs.nativescript.org/angular/ui/ng-ui-widgets/web-view. It could definitely use a few more examples.