dcc redesign: `DatePickerSingle` and `DatePickerRange` #515

Job	Run time
Detect Relevant Path Changes	8s
Build Dash Package	2m 55s
Typing Tests	2m 36s
Run Background & Async Callback Tests (Python ${{ matrix.python-version }})	0s
Table Server Tests (Group ${{ matrix.test-group }})	0s
Table Unit/Lint Tests (Python ${{ matrix.python-version }})	0s
	5m 39s

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