Wizard message UI improvement (#2971)

* improve the wizard message experience - WIP

* undo gitignorechanges

* fix expand button issue

* fix the cursor issue

* use flex to control height

* toggle message detail support

* apply style

* new images

* use template string

* address comments

src/sql/sqlops.proposed.d.ts

@@ -890,6 +890,7 @@ declare module 'sqlops' {
 			 */
 			export type DialogMessage = {
 				readonly text: string,
+				readonly description?: string,
 				readonly level?: MessageLevel
 			};