CSPACE-2418: Groundwork for supporting free-text entry of dates in a variety of forma...

CSPACE-2418: Groundwork for supporting free-text entry of dates in a variety of formats. Added utility routines to retrieve per-tenant lists of properties, and demonstrated retrieval of date formats from those properties, and of validating incoming dates against permitted date formats. Need to add ISO 8601-based patterns corresponding to those permitted by Nuxeo, determine how best to identify date fields whose values might be validated, and identify where during incoming payload handling to convert from non-ISO 8601 formats.