Add log message for new query server

Author: aeisenberg

extensions/ql-vscode/src/query-server/queryserver-client.ts

@@ -105,6 +105,8 @@ export class QueryServerClient extends DisposableObject {
 
   /** Starts a new query server process, sending progress messages to the given reporter. */
   private async startQueryServerImpl(progressReporter: ProgressReporter): Promise<void> {
+    void this.logger.log('Starting NEW query server.');
+
     const ramArgs = await this.cliServer.resolveRam(this.config.queryMemoryMb, progressReporter);
     const args = ['--threads', this.config.numThreads.toString()].concat(ramArgs);