The Boefje.schema field shadows out BaseModel.schema

[ammar92]

Describe the bug
Currently the Boefje.schema field shadows out BaseModel.schema. This can cause trouble, because BaseModel.schema is a dict of the schema (and BaseModel.schema_json is the JSON string representation of that dict)

To Reproduce
Run the Boefje module and monitor the logs; you should see a warning triggered by Pydantic due to the naming conflict

Expected behavior
No warnings should be triggered, and the schema should work as expected (which it probably already did).

Additional context

• We should look for an alternative name
  • Perhaps we can use another field name, but use 'schema' as an aliased name (even if it's just for backward compatibility)
• We need to make sure/ investigate it doesn't have compatibility issues when we change it