🚀 Feature: Custom events through the admin sdk

### 🔖 Feature description It would be really awesome to have the ability to emit custom event through the admin api. ### 🎤 Pitch With this feature we could do cool stuff like execute functions and notify the subscribed clients with the function result without touching the database to trigger events. ### 👀 Have you spent some time to check if this issue has been raised before? - [X] I checked and didn't find similar issue ### 🏢 Have you read the Code of Conduct? - [X] I have read the [Code of Conduct](https://github.com/appwrite/.github/blob/main/CODE_OF_CONDUCT.md)