[INVESTIGATE] Research Regular Data Quality Checks for ASpace Metadata

Is your feature request related to a problem? Please describe.
Research what kinds of metadata are useful for running regularly occurring data quality checks against. Some of the kinds of data we are considering include:

• Invalid dates (begin date after end, non-ISO formatted)
• Items listed as collections for their description level
• Top containers without indicators?
• Resources without EAD IDs?
• Duplicate subjects
• Duplicate agents
• Resources without Creator agents?
• Top containers not linked to resources/archival objects

Describe the solution you'd like
A behavior-driven-development model of requirements for what kinds of data we want to check and how to check for them.

Describe alternatives you've considered
Investigating different methods of running, capturing, and reporting on these data quality checks. We already have a process in place where reports on metadata quality are put in the BestPracticeReports in the SOVA dropbox. It would be good to get a list of all the checks that are run for these reports.

Additional context
Related: Harmonize URI entries (full URI vs. ID) in ASpace subjects and agents - this is an example of a report we could run regularly.