[FEATURE]: .describe("Description of the field") for the schema

### Feature hasn't been suggested before.

- [x] I have verified this feature I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

`.describe("Descrtiption of the field")` just like [in Zod](https://zod.dev/?id=describe)

And then, if we open the studio, and hover over a column name, it shows the description of it too.

👍 - Let me know what do you think, if that would be useful, I could implement it myself and make a PR