Add new Entity Types and Subtypes on Duster

efer to commits for reference

• https://github.com/merklescience/duster/commit/7af41ca003697f76249b1db815aa93efb486e85e

• https://github.com/merklescience/duster/commit/f073bc96c46e44046f17f71ae6564d778c141def

Adding new entity-types and subtypes on Duster is fairly straight forward

1. Add new type choices on utils/entity_subtypes.py

2. Create migration file

In cases you are also adding a new entitytype (not just subtypes), you will also need to make changes to palantir/taxonomies.py as implemented here

https://github.com/merklescience/duster/pull/152