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fix(cdk/tree): CdkTreeNodeToggle responds to Enter and Space keys
Implement keydown event for CdkTreeNodeToggle to perform that same action as click when receiving Enter or Space. Update examples to expand/collapse nodes when pressing enter. Fix a11y issue in demos where pressing Enter when focused on a tree node seems to not perform any action. Use CdkTreeNodeToggle to perform the action of expanding or collaping the node. Align with instructions in [APG Tree View Pattern](https://www.w3.org/WAI/ARIA/apg/patterns/treeview/): "Enter: activates a node, i.e., performs its default action. For parent nodes, one possible default action is to open or close the node. In single-select trees where selection does not follow focus (see note below), the default action is typically to select the focused node."
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