refactor!: consolidate namespace related naming and enterprise integration (#3205)

1. Refactored every client (Rust core, Python, Node/TypeScript) so
“namespace” usage is explicit: code now keeps namespace paths
(namespace_path) separate from namespace clients (namespace_client).
Connections propagate the client, table creation routes through it, and
managed versioning defaults are resolved from namespace metadata. Python
gained LanceNamespaceDBConnection/async counterparts, and the
namespace-focused tests were rewritten to match the clarified API
surface.
2. Synchronized the workspace with Lance 5.0.0-beta.3 (see
https://github.com/lance-format/lance/pull/6186 for the upstream
namespace refactor), updating Cargo/uv lockfiles and ensuring all
bindings align with the new namespace semantics.
3. Added a namespace-backed code path to lancedb.connect() via new
keyword arguments (namespace_client_impl, namespace_client_properties,
plus the existing pushdown-ops flag). When those kwargs are supplied,
connect() delegates to connect_namespace, so users can opt into
namespace clients without changing APIs. (The async helper will gain
parity in a later change)

python/python/tests/test_db.py

@@ -183,8 +183,8 @@ def test_table_names(tmp_db: lancedb.DBConnection):
     result = list(tmp_db.table_names("test2", limit=2))
     assert result == ["test3"], f"Expected ['test3'], got {result}"
 
-    # Test that namespace parameter can be passed as keyword
-    result = list(tmp_db.table_names(namespace=[]))
+    # Test that namespace_path parameter can be passed as keyword
+    result = list(tmp_db.table_names(namespace_path=[]))
     assert len(result) == 3
 
 
@@ -909,7 +909,7 @@ def test_local_namespace_operations(tmp_path):
         NotImplementedError,
         match="Namespace operations are not supported for listing database",
     ):
-        db.list_namespaces(namespace=["test"])
+        db.list_namespaces(namespace_path=["test"])
 
 
 def test_local_create_namespace_not_supported(tmp_path):