WebApp:Add possibleInboundIpAddresses probability to Get-AzWebApp cmdlet

## Description of the new feature

if I made a request https://resources.azure.com/subscriptions/5f4e1a53-5073-41cc-a037-fc5a271ee6c2/resourceGroups/MutasemDNC/providers/Microsoft.Web/sites/MutasemDNC%20%20%20%20%22

I can get a list of the possibleInboundIpAddresses%22:%20%2213.69.68.37%22,

doing a get-azwebapp its not showing this probability
https://docs.microsoft.com/en-us/powershell/module/az.websites/get-azwebapp?view=azps-5.1.0

can you add it to the list of probability

## Proposed implementation details (optional)

Compare the possibleInboundIpAddresses value returned by resources.azure.com with the Get-AzWebApp documentation and locate the Azure Web App API specification that defines the response. Confirm which specification version is used, then update the relevant API definition so the property is represented and verify that the cmdlet can expose it.

Written by the indexing model from the issue text.