(core) Add optional telemetry to grist-core

Summary:
Adds support for optional telemetry to grist-core.

A new environment variable, GRIST_TELEMETRY_LEVEL, controls the level of telemetry collected.

Test Plan: Server and unit tests.

Reviewers: paulfitz

Reviewed By: paulfitz

Subscribers: dsagal, anaisconce

Differential Revision: https://phab.getgrist.com/D3880

stubs/app/server/lib/TelemetryManager.ts

@@ -1,11 +0,0 @@
-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>
-  ) {}
-}

stubs/app/server/lib/create.ts

@@ -1,8 +1,10 @@
 import { checkMinIOExternalStorage,
          configureMinIOExternalStorage } from 'app/server/lib/configureMinIOExternalStorage';
 import { makeSimpleCreator } from 'app/server/lib/ICreate';
+import { Telemetry } from 'app/server/lib/Telemetry';
 
 export const create = makeSimpleCreator({
+  deploymentType: 'core',
   // This can and should be overridden by GRIST_SESSION_SECRET
   // (or generated randomly per install, like grist-omnibus does).
   sessionSecret: 'Phoo2ag1jaiz6Moo2Iese2xoaphahbai3oNg7diemohlah0ohtae9iengafieS2Hae7quungoCi9iaPh',
@@ -13,4 +15,7 @@ export const create = makeSimpleCreator({
       create: configureMinIOExternalStorage,
     },
   ],
+  telemetry: {
+    create: (dbManager, gristServer) => new Telemetry(dbManager, gristServer),
+  }
 });