Added Functionality To PowerItem Endpoint

TODO: Change "addMultiple" to not require a map. That only exists so I could import easily from my old project.

sql/powerItem/query.sql

@@ -14,6 +14,24 @@ SELECT
 FROM
     powerItem;
 
+-- GetAllByType finds all items of a specific type.
+-- name: GetAllByType :many
+SELECT
+    id,
+    itemType,
+    iconURL,
+    itemName,
+    minItemPower,
+    maxItemPower,
+    rarity,
+    origin,
+    tooltip,
+    isEventItem
+FROM
+    powerItem
+WHERE
+    itemType = pggen.arg('itemType');
+
 -- FindByID finds items by the ID
 -- name: FindByID :one
 SELECT