feat: Posthog integration (#9077)

# Which Problems Are Solved

- Adds a service in the console to enable Posthog integration based on
upon user environment variables

# How the Problems Are Solved

- A new service has been created in console for posthog
- This is only initiated based upon provided environment variables

# Additional Changes

N/A

# Additional Context

- Closes #[9076](https://github.com/zitadel/zitadel/issues/9076)
- Cannot be merged until this is completed
#[9070](https://github.com/zitadel/zitadel/issues/9070)

console/src/app/services/environment.service.ts

@@ -13,6 +13,8 @@ export interface Environment {
   issuer: string;
   customer_portal?: string;
   instance_management_url?: string;
+  posthog_token?: string;
+  posthog_url?: string;
   exhausted?: boolean;
 }
 

console/src/app/services/posthog.service.ts

@@ -0,0 +1,43 @@
+import { Injectable, OnDestroy } from '@angular/core';
+import { EnvironmentService } from './environment.service';
+import { Subscription } from 'rxjs';
+import posthog from 'posthog-js';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class PosthogService implements OnDestroy {
+  private posthogToken?: string;
+  private posthogUrl?: string;
+  private envSubscription: Subscription;
+
+  constructor(private envService: EnvironmentService) {
+    this.envSubscription = this.envService.env.subscribe((env) => {
+      this.posthogToken = env.posthog_token;
+      this.posthogUrl = env.posthog_url;
+      this.init();
+    });
+  }
+
+  async init() {
+    if (this.posthogToken && this.posthogUrl) {
+      posthog.init(this.posthogToken, {
+        api_host: this.posthogUrl,
+        session_recording: {
+          maskAllInputs: true,
+          maskTextSelector: '*',
+        },
+        enable_heatmaps: true,
+        persistence: 'memory',
+      });
+    }
+  }
+
+  ngOnDestroy() {
+    if (this.envSubscription) {
+      this.envSubscription.unsubscribe();
+    }
+
+    posthog.reset();
+  }
+}