Add a Focus node to the DropdownButton, and adds an activation action for it. (#42811)
This adds a Focus node to the DropdownButton widget, allowing it to receive keyboard focus, and to show a focus highlight. In addition, I added the ability to activate the dropdown using the "enter" key binding (which is bound to ActivateAction in the WidgetsApp). Related Issues Fixes #42646 Fixes #43008 Fixes #42511
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