refactor!: use namespace models directly for namespace operations (#2806)

1. Use generated models in lance-namespace for request response models
to avoid multiple layers of conversions
2. Make sure the API is consistent with the namespace spec
3. Deprecate the table_names API in favor of the list_tables API in
namespace that allows full pagination support without the need to have
sorted table names
4. Add describe_namespace API which was a miss in the original
implementation

Cargo.lock

@@ -5071,6 +5071,7 @@ dependencies = [
  "futures",
  "lance-core",
  "lance-io",
+ "lance-namespace",
  "lancedb",
  "pin-project",
  "pyo3",