Add 'Week' to interval options

In DuneSQL, interval '1' week does not work. The suggested workaround is to use '7' day, but this also causes datatype failures in the following code (where time granularity is an input - we want calendar months, so '30' day does not suffice) ``` CASE WHEN '{{Time Period}}' = 'week' THEN interval '7' day WHEN '{{Time Period}}' = 'day' THEN interval '1' day WHEN '{{Time Period}}' = 'month' THEN interval '1' month END ```