Collapsing Table's Cells and Rows

[maroon-scorch]

Table Rows Drop targets currently appear with or without hovering, some minor changes needs to be made to how the node is rendered in ast.tsx to make it collapsible (Waiting to be disproven immediately).

In Block Pyret, double clicking on a block shrinks the cell.

Currently we can shrink cells with shrinkable nodes such as lists and tables (which onlty leaves primitive datatype such as number, string, etc. as the unshrinkable ones), but we can't shrink primitive datatypes bc double clicking on them only results in editing them. An idea is to use max/width setting, but perhaps we could also make primitive datatype collapsable if only in tables.