Need update notification for installed modules and scripts

[bmanikm]

• Show toast notification for newer version of module in the gallery, if an older version of that module is installed on the system.
• Notification should be enabled on all supported Platforms and PowerShell versions.
• Registration can be at individual item level or for all installed modules/scripts.

[jherby2k]

Whatever happened with this? As a module author i feel something like this is badly needed.