chore: move the go code into a subfolder

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

@@ -0,0 +1,32 @@
+INSERT INTO projections.current_states (
+    projection_name
+    , instance_id
+    , aggregate_id
+    , aggregate_type
+    , "sequence"
+    , event_date
+    , "position"
+    , last_updated
+    , filter_offset
+) VALUES (
+    $1
+    , $2
+    , $3
+    , $4
+    , $5
+    , $6
+    , $7
+    , now()
+    , $8
+) ON CONFLICT (
+    projection_name
+    , instance_id
+) DO UPDATE SET
+    aggregate_id = $3
+    , aggregate_type = $4
+    , "sequence" = $5
+    , event_date = $6
+    , "position" = $7
+    , last_updated = statement_timestamp()
+    , filter_offset = $8
+;