* Relayout SQL Editor
- Refactor SQL editor to remove usage of bootstrap col, row and collapse to simplify the layout
- Replace the react-split-pane libraray with react-split to allow custom styling of the gutter area without sacrifice correctness of the ace editor height calculation
- Rewrite the left pane animation via plain css transition and animate it to slide in and out
- General code and css clean up
* Smooth out the visual transition during dragging
(cherry picked from commit 19f82b729c7a939f12b1c5da6022c0fd76fa3ec9)
* Adjust how the height of the south pane is computed, fixing cypress tests
