New default column `createdBy`

### 🔖 Enhancement description A new default column that points to a user who created that row. Does not have to be mandatory column. I can stay empty if created by no session or an api key. But if created by a client sdk with session, it should list the user `$id` . ### 🎤 Pitch Assume we are creating a public social media, where users can post and anyone or some users can see that post and the comments related to that post. Now My job is to pretend as Chirag I want to harm or dont like and comment or post making the client app think its Chirag , Not me. Note: I know it does not let me modify his posts, but what I will do is to create new posts as him. Step 1: All posts( rows in the post table) are public or open to a group of users. And those posts do have row level security. I cannot modify existing posts. All post will have an userID column to reference who created that post. I can get the post data. Assume <img width="522" height="356" alt="Image" src="https://github.com/user-attachments/assets/2073605b-3c43-4643-8a60-2987a04f2c70" /> ``` { userId; 12345678 <-(this is Chirag's user ID. The client app uses this id to fetch public details of Chirag to show who posted it.) Data: Hey, I am Chirag. } ``` I can see the userId. I will not modify this row(post). I will create a new post Step2: Create a session. As I need to be a valid user, I will create a session. Now for creating a new post I do have to pass a userID for the userID column. I want to post as chirag and From the public post I have his userID. I can pass that id instead of mine. new post created. <img width="522" height="505" alt="Image" src="https://github.com/user-attachments/assets/a502750a-eb3b-4662-9181-311a8ee6d5bb" /> ``` { userId; 12345678 <-(this is Chirag's user ID. The client app uses this id to fetch public details of Chirag to show who posted it.) Data: Supabase is better than appwrite. } ``` now this post is secured by my Account session. Anyone can see the post. No one can modi…