Summary

Implement node_api_create_object_with_named_properties — a convenience
function that creates a JavaScript object with properties specified by UTF-8
C string names and napi_value values.

This is the "named" counterpart to the existing
node_api_create_object_with_properties (which takes napi_value keys),
following the same pattern as napi_set_named_property vs napi_set_property.

API signature

napi_status node_api_create_object_with_named_properties(
    napi_env env,
    napi_value* result,
    size_t property_count,
    const char** property_names,   // UTF-8 C strings
    const napi_value* property_values);

Changes

• ext/napi/js_native_api.rs — Implementation using internalized V8
  strings for property names (enables deduplication and faster lookups)
• Symbol exports — Registered in symbol_exports.json and all three
  platform .def files
• libs/napi_sys/src/functions.rs — FFI declaration
• tests/napi/ — Native test functions and JS integration tests covering
  both normal and empty property cases

Closes #32595

Test plan

• cargo test --test integration -- napi passes (both napi_tests and
  finalizer test)
• New JS tests verify property creation and retrieval
• Empty property count case tested

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