* Use toast flows
"Toast flows" are a group of toasts that should be shown after each other.
Before this commit, they were implemented by manually removing previous toasts in the same flow.
Now a flowId can be passed and ToastProvider will make sure that there always only exists one toast with the same flowId.
This is different to toast tags since tags don't replace toasts with the same tag, they only are shown "above" them.
* Create wrapper for toast flows
5de014cba8