add jsonb array oid
I don't think using arrays with jsonb is a sensible thing for anyone to do, since json has a native list type already. Going to pass on this. whether you think it is sensible is immaterial, postgresql allows it. and clearly some people have usecases for it.

attempts to add JSONB array column to postgresql.

however unsure of how to use it. the generated code looks correct

however these fail:
```python
Model.update(array=[{}]).where(Model.id == 1).execute()
Model.create(array=[{}])
```