Database operators support on relationship columns

### 🔖 Enhancement description Database operators should allow me to update relationship columns. ### 🎤 Pitch The Array operations look like a great fit for several use-cases on relationship columns. They could be used to add / edit / remove relationships using the id of the related field. Here is an example of how it could be used: ``` await databases.updateRow( databaseId: AppwriteConstants.databaseID, tableId: AppwriteConstants.tableID, rowId: id, data: { "related": Operator.arrayAppend([related_id]) } ); ``` ### 👀 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)