feat(ui5-static-area-item): implement lazy loading

[fifoosid]

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[vladitasev]

Overall looks great - I think this is the way to go.
The only problem I've found is that datepicker/select/etc.. blink when you click their icon. Try comparing f.e. datepicker on live with datepicker now and you'll notice the blue background of the icon

[vladitasev]

@pskelin Currently there is a noticeable delay (picker icon flickers) due to the fact that some of the work happens later now, because the static area items are created on the fly. There are 2 ways to address:

• change the logic of some components to update the icon first
• start using microtask instead of animation frame for rendering. Do you see issues with the second?

[vladitasev]

TabContainer is broken - the popover resizes immediatly after opening and takes up the whole screen

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