[DevTask] Smooth transition of selection toolbox when selection goes out of view

[huchenlei]

Ref: #2608

How figma board handles the selection view transition:

• By default the toolbox is on the top of the selection, but if the top of selection of out of view, the toolbox is moved to the bottom of the selection

board_example1.mp4

• If the whole selection is going out of view, the toolbox will try to keep in view first.

board_example2.mp4

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