🚀 Feature: Add Email Variable at Cursor's Position

### 🔖 Feature description Currently when we click on any email template's variable i.e. `{{team}}`, `{{user}}`, `{{project}}`, `{{redirect}}`, etc., it is then copied to the clipboard & then we have to manually paste it where we want. A better implementation would be to add it where the cursor is positioned in any textfield, Subject or Body. ### 🎤 Pitch Better UX, would save some time from copy / paste. Aso it initially gives the impression that when you click a variable, it will be directly added to the textfield but it isn't. ### 👀 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)