Get Custom Field Contexts Default Values

Returns a [paginated](#pagination) list of defaults for a custom field. The results can be filtered by `contextId`, otherwise all values are returned. If no defaults are set for a context, nothing is returned. The returned object depends on type of the custom field: * `CustomFieldContextDefaultValueDate` (type `datepicker`) for date fields. * `CustomFieldContextDefaultValueDateTime` (type `datetimepicker`) for date-time fields. * `CustomFieldContextDefaultValueSingleOp...