Firestore 转换器
用法
final converter = EntityFirestoreConverter<House>(fromMap: House.fromMap);
final collectionReference = firestore.collection(col).withConverter<House>(
fromFirestore: converter.fromFirestore,
toFirestore: converter.toFirestore,
);
final listResult = await firestore.collection(col).get();
List<House> house = listResult.data();
final oneResult = await firestore.collection(col).doc('x').get();
House? house = oneResult.data();
serverSideTimeStampTimeout
如果指定了 [serverSideTimeStampTimeout],对象中的 DateTime 将转换为服务器端时间戳
如果这些时间戳在更新时间 MU 和 MU – 超时时间之间。
默认值为 null(无效果)