Hi, I came up with this idea while trying to create quick demos showcasing the capabilities and cool features of iceberg-rust. However, I found that setting up the catalog initially consumes most of the time. This isn't ideal for attracting new users or contributors.

I propose introducing a short-lived, in-memory catalog as an ideal starting point for either testing iceberg-rust or using it statelessly.

The design details are currently unclear, and I would like to seek comments and feedback on this idea. What do you think? Do you find the catalog useful?