Add technique name to subtechniques

[matterpreter]

In the data, the name field in the T1205.002 technique is "Socket Filters" but on the primary site, it is "Traffic Signaling: Socket Filters". I would really like to have this full name accessible. Some options include:

1. Modify the name field
2. Add a new field for parent_technique_name
3. Add an optional field based on the state of x_mitre_is_subtechnique

I'm happy to open a PR for this, but since it changed the structure of the data I'd like to know what the preferred format is.