Performance issue due to adding popper classes to body on page with large number of DOM nodes

[huynhtehoa]

Problem

• When a page contains a large number of DOM nodes, toggling floating elements becomes very slow. This happens because floating-vue is adding/removing classes directly on body, which triggers reflowing that affects a lot of nodes

• This is extremely impactful, especially in analytics application that renders tables with many cells

• I do not see that these added classes are used anywhere so I guess they are either legacy or for customization ability

• Using the Egdge performance tool, we could see that $_applyShow and $_applyHide are affecting many elements during the style recalculation phase
  
  

Solution

• Added an addPopperClassesToBody option to disable the adding-popper-classes-to-body behavior
• Default to true to avoid breaking current behavior

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