Should we support flattening object embedding? If yes, how should it be configured? Which of the ways Hibernate ORM has for configuring object embeddings should we support?

• See https://mongodb.slack.com/archives/C07EUDEQ70X/p1738996492125489 for more details and the discussion.
• See com.mongodb.hibernate.BasicInsertionTests.BookWithEmbeddedField, com.mongodb.hibernate.BasicInsertionTests.Author.

Update:

• We decided not to support @Embedded @JdbcTypeCode(SqlTypes.JSON), @Embedded @JdbcTypeCode(SqlTypes.SQLXML). Should we explicitly throw when these annotations are used? We should also investigate whether we can change the behavior of these annotations, because if we can, we may use @Embedded @JdbcTypeCode(SqlTypes.JSON) instead of @Embedded @Struct as the former may be more appropriate.
• After doing more research, nathan.xu@mongodb.com said that changing the existing Hibernate ORM behavior does not seem to be possible (we should double check this). So we technically have only two options: leave the behavior of just @Embedded as is, or forbid using just @Embedded by explicitly throwing.