Allowing to enable animations within Observing and Collect into

[faogustavo]

• Adds an extra parameter to Observing and collect(into:) that enables animation during the state changes
• Behind the scenes, all it does is wrap the value change with a withAnimation using the given animation configuration

[TadeasKriz]

There are also two other parameters to withAnimation: completionCriteria and completion. I wonder if we should have the API done in a way where the current one is without animations and another one that allows us to provide all the parameters. What do you think?

The withAnimation can also return a value, which I'm not sure is something we could use or not, just making sure you're aware.