Refactor validation to use dictionaryutils v3.5.1

```python
!pip install dictionaryutils
import dictionaryutils
# Read bundled json
dd = dictionaryutils.DataDictionary('/Users/harrijh/projects/gen3schemadev/examples/schema/yaml')
dd.load_data(directory='/Users/harrijh/projects/gen3schemadev/examples/schema/yaml')
# returns resolved schema
dd.schema
```