input: Write a function to create a Supplier object and return its string representation.
  assert str(create_supplier("123", "SupplierName", SupplierType.INTERNAL, True, "module123", {})) == "SupplierName"
  assert str(create_supplier("456", "AnotherSupplier", SupplierType.EXTERNAL, False, "module456", {"key": "value"})) == "AnotherSupplier"
output: class SupplierType:
      INTERNAL = "INTERNAL"
      EXTERNAL = "EXTERNAL"
  
  class Supplier:
      def __init__(self, id, name, supplier_type, active, module, metadata):
          self.id = id
          self.name = name
          self.supplier_type = supplier_type
          self.active = active
          self.module = module
          self.metadata = metadata
  
      def __str__(self):
          return self.name
  
  def create_supplier(id, name, supplier_type, active, module, metadata):
      supplier = Supplier(id, name, supplier_type, active, module, metadata)
      return supplier