feat(purchases): add purchase location tracking queries

bricktracker/sql/set/list/using_purchase_location.sql

@@ -0,0 +1,5 @@
+{% extends 'set/base/full.sql' %}
+
+{% block where %}
+WHERE "bricktracker_sets"."purchase_location" IS NOT DISTINCT FROM :purchase_location
+{% endblock %}

bricktracker/sql/set/metadata/purchase_location/all.sql

@@ -0,0 +1,14 @@
+{% extends 'set/metadata/purchase_location/base.sql' %}
+
+{% block total_sets %}
+IFNULL(COUNT("bricktracker_sets"."id"), 0) AS "total_sets"
+{% endblock %}
+
+{% block join %}
+LEFT JOIN "bricktracker_sets"
+ON "bricktracker_metadata_purchase_locations"."id" IS NOT DISTINCT FROM "bricktracker_sets"."purchase_location"
+{% endblock %}
+
+{% block group %}
+GROUP BY "bricktracker_metadata_purchase_locations"."id"
+{% endblock %}