Implement StructuredData OSD model and containers

tests/compat/tests/types_structured_shims.rs

@@ -22,12 +22,9 @@ fn catalog_values_and_inert_layouts_are_real() {
 }
 
 #[test]
-fn serializer_entry_point_returns_its_exact_member_id() {
+fn parser_dispatch_rejects_empty_input_without_calling_a_decoder() {
     let Err(error) = OSDParser::deserialize_with_bytes(Vec::new()) else {
-        panic!("failure-only serializer unexpectedly returned a value");
+        panic!("empty structured data unexpectedly returned a value");
     };
-    assert_eq!(
-        error.csharp_member(),
-        Some("M:LibreMetaverse.StructuredData.OSDParser.Deserialize(System.Byte[])")
-    );
+    assert_eq!(error, libremetaverse_types::Error::Argument);
 }