chore: move the go code into a subfolder

apps/api/internal/eventstore/handler/v2/state_lock.sql

@@ -0,0 +1,9 @@
+INSERT INTO projections.current_states (
+    projection_name
+    , instance_id
+    , last_updated
+) VALUES (
+    $1
+    , $2
+    , now()
+) ON CONFLICT DO NOTHING;