Adding ability to expand and columns slickgrid table rows (#19168)

* Adding ability to expand and columns tables

* Bolding icons
Fixing variable names

* Adding helper function
Making css more target

* Adding keyboard navigation and parsing treegrid data

* Adding attributes, data transformations and key events to the treegrid

* Expanded

* changing var name

* FIxing formatter name

* Adding back cell styling

* Removing comments

* Making a new TreeGrid component.
Separating treegrid logic from tableDataView

* Fixing comments

* changing method name

* Modifying only visible row dom attributes

* Removing white space, moving role attribute setter to constructor.

* Fixing some more PR comments

* Adding comments and renaming functions

* Fixing comments

* Fixing comments

* Fixing comments

* Fixing some logic and removing unused attributes from element

* Adding expandable formatter to the first column

* Making the formatter generic

* Reverting formatter code

* Adding doc comments

* Fixing comments

* Removing duplicated code

* Adding comments

* Setting columns only when the table is initialized

* Letting users set expanded state instead of forcing it to false

src/sql/base/browser/ui/table/media/table.css

@@ -234,3 +234,8 @@
 	display: flex;
 	align-items: center;
 }
+
+.slick-cell .toggle {
+	font-size: 12px !important;
+	margin-right: -5px;
+}