[property editor] consider badging individual dropdown items as default instead of property UI

[kenzieschmoll]

When I opened a dropdown list for an enum value, I found myself wanting to know which value was the default value. If we were to badge the individual dropdown items instead of the entire property row, it would be easy to know which value is the default.

The problem with badging the property row instead of the dropdown item is that, if the selection is a non-default value, you have no way of knowing which value is the default based on the UI:

[elliette]

This will require a change to the analysis server API to return the "defaultValue" of a parameter. I've added that field to the API spec. FYI @DanTup as well

[kenzieschmoll]

Don't we already know this information? How are we applying the "default" badge today? This FR was a request to move the placement of that "default" badge to the dropdown item itself instead of having it be on the right of the dropdown menu.

[DanTup]

Today we only provide a boolean for whether the current value is the default, but for this we'll need to provide the actual default value so it can be compared against things that aren't the current value.