[feature] Positioning of Dropdown menus

[kappa-gooner]

Here's the snippet from codepen

Is there a way to reposition the dropdown to be center aligned with the trigger button?
I feel that some more extensibility would be great for the dropdown component. This is a great reference for dropdown menus IMO.

I'd be happy to raise a PR if you're happy to accept it 🥇

[afc163]

It is a feature already supported in dropdown, but documentation and demo is missing in antd. I fixed it in above commit 5a64341. 😓

[afc163]

And the direction of pop animation have some problems now.

[lock]

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