mat-select should have a "selectionMade" output

[marcoliceti]

Feature Description

mat-select has an output that can be used to be notified when selection changes. This is not useful when you need to be notified also when the current selection is confirmed, i.e.

1. Current selected option is "foo".
2. User clicks on the select control and clicks again on "foo".

Use Case

I don't see why this event shouldn't be notified. Any user selection can be meaningful, not only when the selected option changes.

A concrete use case is when you are implementing a "smart" control that switches from a simple label to an actual select when you click on it and then switches back to a simple label when a selection is made (possibly confirming the currently selected option).

Without the requested feature, the mat-select element will remain visible each time the user confirms the currently selected option, thus breaking the kind of UX that I described.

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