Task name

AzureAppServiceManageV0

Describe your feature request here

When using the "Install Extensions" action in AzureAppServiceManageV0, you can only specify the extension name (or a list of extension names) but not a specific version. So when you want to update the extension, you have to manually remove the extension and rerun the task so that it reinstalls the extension with the latest version. Having the ability to specify the version of the extension you want installed, will allow you to better manage your app service extensions.

In addition to that, having some sort of feature that allows a user to just take the latest available version of an extension could be helpful as well. In the current state, the task checks for if the extension is already installed and doesn't take any further action if that condition is true.