User uploaded objects are scanned for PII

[mdial89f]

Adding PII scanning to the uploaded objects has been mentioned and would be a great addition to the quickstart.
This is targeted as a use case for AWS Macie, but this issue won't prescribed the technology.
It also won't prescribe the exact actions to take upon finding potential PII.
What's important for this quickstart is that the plumbing is there, and there's an existing framework to scan for PII, trigger an event on findings, and take action. The details of those actions aren't super important. Maybe send an email, tag the object, or delete it.
Do what you think is best. Keep it flexible.

AC:

• user uploads are scanned for Personally Identifiable Information (PII) in near real time (read: event driven)
• findings of the PII scan trigger an event of some kind where action is taken (email submitter, delete, )