Integrate notebook service with notebook UI (#3143)

Port notebookView code over to notebook.component.ts.
Integrate loading of notebook contents into the UI

src/sql/parts/notebook/cellViews/textCell.css

@@ -10,4 +10,5 @@ text-cell-component {
 text-cell-component .notebook-preview {
 	border-top-width: 1px;
 	border-top-style: solid;
+	user-select: initial;
 }