Implement Notification System

The desired feature would implement a Notification system which is more elegant and modern way to notify the user about things, rather than using Message Boxes. This is useful for user experience as well as for plugins

Describe the solution you'd like A clean and modern notification:

• show a message to the user
• have several types (Error, Info, Warning,...)
• will be closed after n seconds
• have a close button
• support multi-line + scrolling
• would be exported as an API and would be highly helpful for plugins
• should be stacked one above the other (if there are more than 1 notifications)

Additional context

PyCharm notifications:

VSCode notifications: