Add bindings/python into root workspace.

[blackmwk]

Currently the python binding, e.g pyiceberg_core is in a standalone workspace, and excludes from root workspace. This cause some troubles for us:

1. Missing check for pyiceberg_core. In root workspace, we have several jobs to check things like toml, clippy, rust format. But these are missing for pyiceberg_core crate.
2. Diverged dependency version management. The root workspace shares a lot dependencies with with pyiceberg_core, such as tokio, datafusion, etc. Due to the possible instability of public apis such as arrow and datafusion, this may cause trouble for us to maintain.

We are in fact releasing pyiceberg_core with core iceberg crates with same schedule, so I would suggest to move pyiceberg_core to root workspace.

[Fokko]

This makes sense to me, I don't think we want to release pyiceberg_core seperately, so that's not an issue 👍

[kevinjqliu]

+1 great idea. we dont need to maintain a completely separate crates/package under bindings/python

[blackmwk]

Seems we reached consensus on it, resolved in #2506 , thanks @kevinjqliu !