feat(snaps): Add integration for new RPC method snap_trackEvent (#15209)

## **Description**
Add integration for new RPC method: `snap_trackEvent`

SIP-32: https://metamask.github.io/SIPs/SIPS/sip-32

Related PRs:
- Snaps: MetaMask/snaps#3375
- Extension: MetaMask/metamask-extension#32554

## **Related issues**
MetaMask/snaps#3274

## **Manual testing steps**
1. Within some of the preinstalled Snaps use `snap_trackEvent` RPC
method and send some tracking data in format specified in
[SIP-32](https://metamask.github.io/SIPs/SIPS/sip-32).
2. Find a way and verify that the event is sent (intercept MetaMetrics
track event method or check with other e2e metrics testing utilities)

Example Snap code used for testing the method:
```typescript
await snap.request({
  method: 'snap_trackEvent',
  params: {
    event: {
      event: 'SnapExportUsed',
      properties: {
        export: 'onRpcRequest',
        origin: 'https://metamask.io',
        snap_category: null,
        snap_id: 'npm:@metamask/example-snap',
        success: true,
      },
      sensitiveProperties: {
        transaction_hash: 'transaction-hash',
      },
    },
  },
});
```

## **Screenshots/Recordings**
### **Before**
n/a

### **After**
n/a

## **Pre-merge author checklist**
- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**
- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

Author: david0xd

app/core/Permissions/specifications.js

@@ -171,6 +171,7 @@ export const unrestrictedMethods = Object.freeze([
   'snap_resolveInterface',
   'snap_setState',
   'snap_scheduleBackgroundEvent',
+  'snap_trackEvent',
   'snap_cancelBackgroundEvent',
   'snap_getBackgroundEvents',
   'snap_experimentalProviderRequest',

app/core/Snaps/SnapsMethodMiddleware.ts

@@ -26,6 +26,9 @@ import {
   SnapInterfaceControllerUpdateInterfaceStateAction,
 } from '../Engine/controllers/snaps';
 import { KeyringTypes } from '@metamask/keyring-controller';
+import { MetaMetrics } from '../../../app/core/Analytics';
+import { MetricsEventBuilder } from '../Analytics/MetricsEventBuilder';
+import { Json } from '@metamask/utils';
 
 export function getSnapIdFromRequest(
   request: Record<string, unknown>,
@@ -121,6 +124,19 @@ const snapMethodMiddlewareBuilder = (
       controllerMessenger,
       SnapControllerGetSnapAction,
     ),
+    trackEvent: (eventPayload: {
+      event: string;
+      properties: Record<string, Json>;
+      sensitiveProperties: Record<string, Json>;
+    }) => {
+      MetaMetrics.getInstance().trackEvent(
+        MetricsEventBuilder.createEventBuilder({
+          category: eventPayload.event,
+          properties: eventPayload.properties,
+          sensitiveProperties: eventPayload.sensitiveProperties,
+        }).build(),
+      );
+    },
     updateInterfaceState: controllerMessenger.call.bind(
       controllerMessenger,
       SnapInterfaceControllerUpdateInterfaceStateAction,