chore: move the go code into a subfolder

apps/api/cmd/setup/15/05_current_states.sql

@@ -0,0 +1,15 @@
+CREATE TABLE IF NOT EXISTS projections.current_states (
+    projection_name TEXT NOT NULL
+    , instance_id TEXT NOT NULL
+
+    , last_updated TIMESTAMPTZ
+
+    , aggregate_id TEXT
+    , aggregate_type TEXT
+    , "sequence" INT8
+    , event_date TIMESTAMPTZ
+    , "position" DECIMAL
+
+    , PRIMARY KEY (projection_name, instance_id)
+);
+CREATE INDEX IF NOT EXISTS cs_instance_id_idx ON projections.current_states (instance_id);