chore: Add maturin import hook for development

[kylebarron]

The main problem here is if I manually develop a release build for testing

> uv run maturin develop -m obstore/Cargo.toml --release

then the maturin import hook will still rebuild with a debug wheel when I start Python:

>>> import obstore
building "obstore"
rebuilt and loaded package "obstore" in 5.832s
<frozen importlib._bootstrap>:228: RuntimeWarning: obstore has not been compiled in release mode. Performance will be degraded.