feat(cdk/drag-drop): support configurable propagation of mousedown and touchstart events.

[pycraft114]

fix for: #19334

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[pycraft114]

@googlebot I signed it!

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[pycraft114]

@lincolnthree Looks like I need your consent :)

[lincolnthree]

@googlebot I consent.

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[lincolnthree]

@pycraft114 Thank you very much!

[bvkimball]

Is there a timeline on getting this merged?

[lschuft]

+1. I'm having an issue where this fix would be useful!

[crisbeto]

It looks like this should've been resolved by #21227. Closing.

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