add api to open new project dialog with only one project type with filtered target platforms (#16315)

extensions/data-workspace/src/dataworkspace.d.ts

@@ -40,6 +40,13 @@ declare module 'dataworkspace' {
 		  * Verifies that a workspace is open or if it should be automatically created
 		  */
 		validateWorkspace(): Promise<boolean>;
+
+		/**
+		 * Opens the new project dialog with only the specified project type
+		 * @param projectType project type to open the dialog for
+		 * @returns the uri of the created the project or undefined if no project was created
+		 */
+		openSpecificProjectNewProjectDialog(projectType: IProjectType): Promise<vscode.Uri | undefined>;
 	}
 
 	/**