Feature data date roller extension

Added the dataDateRoller Extension. Modified the following example resource and CDS Hooks request body to demonstrate its usage:

opioid-cds-r4/input/examples/encounter-example-rec-10-end-of-life-med-exclusion-context.xml
opioid-cds-r4/input/pagecontent/requests/OpioidCDSREC10PatientView/request-example-rec-10-patient-view-2-illicit-drugs.json

cqframework / opioid-cds-r4