Notebooks: re-factor grid streaming (#12937)

* refactor grid streaming (convert to data first)

* change convertRowsToHtml method to return value

* remove griddataconversioncomplete checks

* send row data from STS to gridoutput component

* clean up code

* send data updates to cell model

* serialize cell output at the end of cell execution

* remove unused parameters

* update output contents instead of output reference

* remove unnecessary promise

* move azdata changes to proposed

* update comment

src/sql/azdata.d.ts

@@ -4701,9 +4701,11 @@ declare module 'azdata' {
 
 		export interface ICellOutput {
 			output_type: OutputTypeName;
-			metadata?: {
-				azdata_chartOptions?: any;
-			};
+			metadata?: ICellOutputMetadata;
+		}
+
+		export interface ICellOutputMetadata {
+			azdata_chartOptions?: any;
 		}
 
 		/**
@@ -4736,7 +4738,9 @@ declare module 'azdata' {
 			/**
 			 * Optional metadata, also a mime bundle
 			 */
-			metadata?: {};
+			metadata?: {
+				resultSet?: ResultSetSummary;
+			};
 		}
 		export interface IDisplayData extends IDisplayResult {
 			output_type: 'display_data';