Improve functions debbugging

Hi 👋🏻
A lot of people have some difficulties to debug functions.

From Lior539 on Discord:

> I find it incredibly difficult to debug any issues with Postgres function. The Postgres logs on Supabase show me what the error was, but there's no help beyond. This makes it a guessing game when it comes to fixing your postgres code. Ultimately I ended wasting a ton of time debugging issues with postgres functions and my project is still very simple. I shudder to think what would happen as it grows more complex

I think it can be interesting to improve that part.