getConnections API (#5651)

* getConnections

* update

* fix the condition check

* pr feedback

* fix test cases

* add test for the new method

* address comments

src/sql/platform/connection/common/connectionManagement.ts

@@ -282,6 +282,13 @@ export interface IConnectionManagementService {
 	getProviderProperties(providerName: string): ConnectionProviderProperties;
 
 	getConnectionIconId(connectionId: string): string;
+
+	/**
+	 * Get known connection profiles including active connections, recent connections and saved connections.
+	 * @param activeConnectionsOnly Indicates whether only get the active connections, default value is false.
+	 * @returns array of connections
+	 */
+	getConnections(activeConnectionsOnly?: boolean): ConnectionProfile[];
 }
 
 export enum RunQueryOnConnectionMode {