Add tags to obs_getavailablegeometries

Fixes #260

* Adds `geom_type`, `geom_extra`, and `geom_tags` to `OBS_GetAvailableGeometries`. This brings it up to spec with existing docs.
* Adds `timespan_type`, `timespan_extra`, and `timespan_tags` to `OBS_GetAvailableTimespans` for consistency.

src/pg/sql/42_observatory_exploration.sql

@@ -252,6 +252,9 @@ CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetAvailableGeometries(
   geom_aggregate TEXT,
   geom_license TEXT,
   geom_source TEXT,
+  geom_type TEXT,
+  geom_extra JSONB,
+  geom_tags JSONB,
   valid_numer BOOLEAN,
   valid_denom BOOLEAN,
   valid_timespan BOOLEAN,
@@ -286,6 +289,9 @@ BEGIN
              NULL::TEXT geom_aggregate,
              NULL::TEXT license,
              NULL::TEXT source,
+             geom_type::TEXT,
+             geom_extra::JSONB,
+             geom_tags::JSONB,
       $1 = ANY(numers) valid_numer,
       $2 = ANY(denoms) valid_denom,
       $3 = ANY(timespans) valid_timespan
@@ -319,6 +325,9 @@ CREATE OR REPLACE FUNCTION cdb_observatory.OBS_GetAvailableTimespans(
   timespan_aggregate TEXT,
   timespan_license TEXT,
   timespan_source TEXT,
+  timespan_type TEXT,
+  timespan_extra JSONB,
+  timespan_tags JSONB,
   valid_numer BOOLEAN,
   valid_denom BOOLEAN,
   valid_geom BOOLEAN
@@ -343,8 +352,11 @@ BEGIN
            timespan_description::TEXT,
            timespan_weight::NUMERIC,
            NULL::TEXT timespan_aggregate,
-           NULL::TEXT license,
-           NULL::TEXT source,
+           NULL::TEXT timespan_license,
+           NULL::TEXT timespan_source,
+           NULL::TEXT timespan_type,
+           NULL::JSONB timespan_extra,
+           NULL::JSONB timespan_tags,
     $1 = ANY(numers) valid_numer,
     $2 = ANY(denoms) valid_denom,
     $3 = ANY(geoms) valid_geom_id