Fix #3420 Analyze in notebook doesn't include text (#3482)

- Add edit API that can be used in the extension
- Separated document and editor classes out since this is the point those get big. I can refactor back in if needed to ease code review
- Based this off text editing APIs but tweaked for the fact this is a cell/array based set of edits

src/sql/parts/notebook/notebook.component.ts

@@ -40,6 +40,7 @@ import { fillInActions, LabeledMenuItemActionItem } from 'vs/platform/actions/br
 import { IObjectExplorerService } from 'sql/parts/objectExplorer/common/objectExplorerService';
 import * as TaskUtilities from 'sql/workbench/common/taskUtilities';
 import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
+import { ISingleNotebookEditOperation } from 'sql/workbench/api/common/sqlExtHostTypes';
 
 export const NOTEBOOK_SELECTOR: string = 'notebook-component';
 
@@ -379,4 +380,12 @@ export class NotebookComponent extends AngularDisposable implements OnInit, OnDe
 	isDirty(): boolean {
 		return this.notebookParams.input.isDirty();
 	}
+
+	executeEdits(edits: ISingleNotebookEditOperation[]): boolean {
+		if (!edits || edits.length === 0) {
+			return false;
+		}
+		this._model.pushEditOperations(edits);
+		return true;
+	}
 }