WebView Right Click & Navigation requested notification

**Right Click**
Ability to show a native context menu, where menu items are defined in XAML/C#, for the WebView when a right click is performed.
Use Cases :
- Show native context menu when right click on the WebView

**Navigation Requested (decision-making)**
Notify when navigation is being requested providing the option to allow or cancel.
Intent is to support the concept of whitelisting and provide ability to review each requested URL to allow or cancel navigation accordingly.
Use Cases :
- Intercept function to launch a web request
- Override calls to different webpages
- Navigation to non-whitelisted URL's
Only whitelisted URL's
- Configuration based domains
Ex. JSON : Domain whitelisting (ex. *.microsoft.com)