Unify the Rust python module and feature setup

[mmastrac]

Some AOT work to support a PyO3 upgrade and start on the way to a more optimal, monolithic Rust library to provide python services.

• Start work on upgrading pyo3 by unifying the pyo3 and tokio versions into the workspace root.
• Create a universal python_extension feature for all modules (older modules turn this on by default and the entire module is disabled if using --no-default-features). This feature may be adjusted in the future as we upgrade pyo3 further.
• Ensure that cargo test, cargo test --all-features, and cargo test --no-default-features all work.
• The wasm-bindgen feature of edgeql-parser had rotted and has been removed entirely.