feat: add validation feature for row count comparison

Add a validate command that compares row counts between source and target tables after a migration.

internal/app/models/main.go

@@ -8,12 +8,16 @@ import (
 
 type UnknownRowValues = []any
 
+type BatchRef struct {
+	Id          uuid.UUID
+	PartitionId uuid.UUID
+}
+
 type Batch struct {
-	Id              uuid.UUID
-	PartitionId     uuid.UUID
-	ParentBatchesId []uuid.UUID
-	Rows            []UnknownRowValues
-	RetryCounter    int
+	Id            uuid.UUID
+	ParentBatches []BatchRef
+	Rows          []UnknownRowValues
+	RetryCounter  int
 }
 
 type PartitionRange struct {