feat: add type definitions for draco3dgltf module

src/types/draco3dgltf.d.ts

@@ -0,0 +1,7 @@
+declare module 'draco3dgltf' {
+  const draco3d: {
+    createDecoderModule(): Promise<unknown>;
+    createEncoderModule(): Promise<unknown>;
+  };
+  export default draco3d;
+}