chore: move the go code into a subfolder

apps/api/internal/cache/connector/pg/get.sql

@@ -0,0 +1,19 @@
+update cache.objects
+set last_used_at = now()
+where cache_name = $1
+	and	(
+		select object_id
+		from cache.string_keys k
+		where cache_name = $1
+			and index_id = $2
+			and index_key = $3
+		) = id
+	and case when $4::interval > '0s'
+		then created_at > now()-$4::interval -- max age
+		else true
+	end
+	and case when $5::interval > '0s'
+		then last_used_at > now()-$5::interval -- last use
+		else true
+	end
+returning payload;