* Introduce a snapshot check for equivalence tests
* New snapshots
* Allow overriding plan timestamp for snapshots
* Allow setting the seed externally (as an env var) for testing purposes
* Remove an equivalence test that depends on a random number
* add test cases
* run equivalence tests
* delete old outputs
* drift_relevant_attributes should ignore the number attribute
* also add a test for data reads
* test destroy only
