add configuration for STS parallel message processing (#19279)

* add configuration for parallel processing

* update setting description

* vbump sts

* enable feature for dev by default

extensions/mssql/src/utils.ts

@@ -20,6 +20,7 @@ const configLogRetentionMinutes = 'logRetentionMinutes';
 const configLogFilesRemovalLimit = 'logFilesRemovalLimit';
 const extensionConfigSectionName = 'mssql';
 const configLogDebugInfo = 'logDebugInfo';
+const parallelMessageProcessingConfig = 'parallelMessageProcessing';
 
 /**
  *
@@ -92,6 +93,18 @@ export function getConfigTracingLevel(): string {
 	}
 }
 
+export async function getParallelMessageProcessingConfig(): Promise<boolean> {
+	const config = getConfiguration();
+	if (!config) {
+		return false;
+	}
+	const quality = await getProductQuality();
+	const setting = config.inspect(parallelMessageProcessingConfig);
+	// For dev environment, we want to enable the feature by default unless it is set explicitely.
+	// Note: the quality property is not set for dev environment, we can use this to determine whether it is dev environment.
+	return (quality === undefined && setting.globalValue === undefined && setting.workspaceValue === undefined) ? true : config[parallelMessageProcessingConfig];
+}
+
 export function getLogFileName(prefix: string, pid: number): string {
 	return `${prefix}_${pid}.log`;
 }
@@ -352,3 +365,8 @@ export async function getOrDownloadServer(config: IConfig, handleServerEvent?: (
 
 	return serverdownloader.getOrDownloadServer();
 }
+
+async function getProductQuality(): Promise<string> {
+	const content = await fs.readFile(path.join(vscode.env.appRoot, 'product.json'));
+	return JSON.parse(content?.toString())?.quality;
+}