Filter on a a list of valid TYPE values on load

[fils]

Need the ability to filter out (or only allow) certain TYPE values.

This is needed in the case where things like BREADCRUMB types are indexed but we don't want these in the graph.

A utility script to remove these from an object store might help for Gleaner architecture with the object store. However, it would be good to still have this in Nabu as well.

Somewhat related to: gleanerio/gleaner#128