chore: move the go code into a subfolder

apps/api/internal/eventstore/v3/sequences_query.sql

@@ -0,0 +1,18 @@
+WITH existing AS (
+    %s
+) SELECT 
+    e.instance_id
+    , e.owner
+    , e.aggregate_type
+    , e.aggregate_id
+    , e.sequence
+FROM 
+    eventstore.events2 e
+JOIN 
+    existing 
+ON 
+    e.instance_id = existing.instance_id
+    AND e.aggregate_type = existing.aggregate_type
+    AND e.aggregate_id = existing.aggregate_id
+    AND e.sequence = existing.sequence
+FOR UPDATE;