Detect if DialogRef close has been called

[MikeMatusz]

Feature Description

Provide a method/property on DialogRef to indicate the dialog is in a closing state (i.e. dialogRef.close() has been called). For example: dialogRef.isClosing() or dialogRef.state

Use Case

There is a small but non-negligible span of time between calling dialogRef.close() and the dialog actually being removed. It would be nice to be able to prevent certain user actions during this time, in a generic fashion. Currently, you either have to take another action every time you call close() (which doesn't account for calls coming from within the component, could be missed/isn't generic) or check the _state property of MatDialogContainer (which is an internal property of an internal class, so not something anyone should do). Having this state indicator would allow a single common component used on many dialogs to handle such a behavior.

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