🚀 Feature: APPWRITE_FUNCTION_EVENT_DATA should contain change

### 👟 Reproduction steps perform change/update to your DB ### 👍 Expected behavior triggered function should receive "a change" ie OLD data vs NEW data ### 👎 Actual Behavior You will get dump of updated data, but you have no idea what was there before. So how we should "act" onUpdate? ### 🎲 Appwrite version Version 0.14.x ### 💻 Operating system MacOS ### 🧱 Your Environment docker ### 👀 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/appwrite/blob/HEAD/CODE_OF_CONDUCT.md)