Add ImportResolver interface and use it for global imports

src/ir/import-name.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2026 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_ir_import_name_h
+#define wasm_ir_import_name_h
+
+#include <ostream>
+
+#include "support/name.h"
+
+namespace wasm {
+
+struct ImportName {
+  Name module;
+  Name name;
+
+  friend std::ostream& operator<<(std::ostream& o, const ImportName& qname) {
+    return o << qname.module << "." << qname.name;
+  }
+};
+
+} // namespace wasm
+
+#endif // wasm_ir_import_name_h