Keep IVF probe fields unset by default so Lance supplies adaptive
behavior. Preserve `nprobes`, `minimum_nprobes`, and `maximum_nprobes`
independently through Rust, Python, namespace, and remote request
construction, with compatibility fields serialized only when explicitly
configured.
The final Rust namespace and LSM propagation update depends on the Lance
release containing lance-format/lance#9184.
Jack Ye
f305a05fd4