Add data cleanup op/flag #9
Description
When testing with thumper, a lot of different data is created. When running different scripts, different data is created and might interfere with other scripts.
I run into a problem, where I checked LookupResources and expeced a certain result that I have created during that testrun. But in another run, I created another resource with a relation to the same subject. Therefore the check failed.
To solve this, it would be great to have an op (or flag) to cleanup all data for a specific definition namespace (test preheating?). Usually I create my schema with thumper with the {{ .Prefix }} so I should be able to delete all data under this namespace (probably including the schema itself). This way, a test run will become reproducible.