MongoDB Connector should use RawBsonDocument instead of Document

When we use oplog capture mode, we convert the oplog into a Document https://github.com/debezium/debezium/blob/main/debezium-connector-mongodb/src/main/java/io/debezium/connector/mongodb/MongoDbStreamingChangeEventSource.java#L198-L199

Similar for change stream API https://github.com/debezium/debezium/blob/main/debezium-connector-mongodb/src/main/java/io/debezium/connector/mongodb/MongoDbStreamingChangeEventSource.java#L311-L312

This implies a deserialization on every event from raw bytes into bson.Document. Is there any reason we are not considering using `RawBsonDocument` directly for efficiency type-safety reason?

edit: I realized RawBsonDocument itself is still a BSON document, which means there will be no efficiency gain but mostly for type-safe and extensibility