Schema Compare extension (#4974)

* extension now working

* fix diff editor title disappearing and remove border from source and target name boxes

* redoing a bunch of stuff that disappeared after rebasing

* add images and add to extensions.ts

* moving a few changes to the right place after rebase

* formatting

* update toolbar svgs

* addressing comments

* add return types

* Adding PR comments

* Adding light and dark theme icons

* Fixing the diff editor title for dark theme

src/sql/sqlops.d.ts

@@ -39,6 +39,7 @@ declare module 'sqlops' {
 
 		export function registerDacFxServicesProvider(provider: DacFxServicesProvider): vscode.Disposable;
 
+
 		/**
 		 * An [event](#Event) which fires when the specific flavor of a language used in DMP
 		 * connections has changed. And example is for a SQL connection, the flavor changes
@@ -1324,6 +1325,7 @@ declare module 'sqlops' {
 		generateDeployPlan(packageFilePath: string, databaseName: string, ownerUri: string, taskExecutionMode: TaskExecutionMode): Thenable<GenerateDeployPlanResult>;
 	}
 
+
 	// Security service interfaces ------------------------------------------------------------------------
 	export interface CredentialInfo {
 		id: number;