(core) Add telemetry

Test Plan: Server tests.

Reviewers: jarek

Differential Revision: https://phab.getgrist.com/D3818

stubs/app/server/lib/TelemetryManager.ts

@@ -0,0 +1,11 @@
+import {TelemetryEventName} from 'app/common/Telemetry';
+import {HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
+
+export class TelemetryManager {
+  constructor(_dbManager: HomeDBManager) {}
+
+  public logEvent(
+    _name: TelemetryEventName,
+    _metadata?: Record<string, any>
+  ) {}
+}