Add example for PII data handling

[jankatins]

Current idea:

• Wait for Lake Formation getting implmented (#8)
• Add a second glue job which pulls PII data out of the orginal data: `(id, hash, unhashed data)
• Add a second dbt job which transforms this into a reasonable dataset useable, by e.g. a CRM team or so... (NOT analytics!)
• Put restriction on that data who can access it (e.g. a second superset account as an example?)

DoD:

• we have an example of PII usage