Currently the bson package depends on the bsonx package which is a reverse of the dependency we should have. A stable package should not be depending on an unstable package, if possible. Therefore, we need to reverse the dependency.

To reverse the dependency, the tests for the bsonx types need to be moved from the bson package to the bsonx package and the usage of bsonx types within the other tests for the bson package need to be changed to use bsoncore or bson/primitive types.