dcc: refactor input #232

Job	Run time
Build Dash Package	1m 40s
Detect Relevant Path Changes	5s
Run Background & Async Callback Tests (Python ${{ matrix.python-version }})	0s
Table Server Tests (Group ${{ matrix.test-group }})	0s
Typing Tests	0s
Table Unit/Lint Tests (Python ${{ matrix.python-version }})	0s
	1m 45s

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