OPENIDM-4453: sync users of roles when roles are sync'd

OPENIDM-4775: 'validate' attribute for collection relationships should be within items config.

OPENIDM-4557: create relationship validators.

[OPENIDM-4283] Fixes for historical account linking sample.

OPENIDM-4488: reverse side of roles and managers needed to be validate=true too.

OPENIDM-4441 only fetch relationship fields that are not hidden or have been explicitly requested

[OPENIDM-4348] Added account enabling/disabling to historical accounts sample.

OPENIDM-4453: sync script on assignments to sync users of roles of the assignment being sync'ed

[OPENIDM-4420] Moved managed object properties config into schema.

OPENIDM-4247: delete update-users-of-role.js in favor of utilizing OPENIDM-4387

[OPENIDM-4335] Moved "returnByDefault" and "isVirtual" flags to always be at base of property schema.

[OPENIDM-4223] Updated samples for assignment refactoring

[OPENIDM-3997] Added sample for historical account linking.