Editable table: Improve current Drag n Drop approach

[DzmitryTrubchyk]

Create 2 concepts, one of them will be applied as approved approach:

1. Concept based on design (open in Figma)

• Add indicators of levels for tree table
• Improve all styles for draggable item (make opacity, leave 1st cell visible, etc. as per design)
• Highlight parent level rows in light blue

See details on image below

2. Concept with fixed position by X coordinate of draggable row

• Add indicators of levels for tree table
• Improve styles for draggable item (make opacity, but keep row cells fully visible)
• Fix of draggable row by X coordinate

[DzmitryTrubchyk]

I would suggest to improve following points, during this issue:

• Remove bg from hover and active state for rows. See details on image:

CC @Kuznietsov, @AlekseyManetov

[AlekseyManetov]

Draft implementation(currently on hold): https://github.com/epam/UUI/pull/2292