class_docstr: Constructs a protocol service stub class using a service descriptor.
  
  Given a service descriptor, this class constructs a suitable stub class.
  A stub is just a type-safe wrapper around an RpcChannel which emulates a
  local implementation of the service.
  
  One service stub builder instance constructs exactly one class. It means all
  instances of that class share the same service stub builder.
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docstr: Initializes an instance of the service stub class builder.
  
  Args:
    service_descriptor: ServiceDescriptor to use when constructing the
      stub class.
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code: def __init__(self, service_descriptor):
      """Initializes an instance of the service stub class builder.
  
      Args:
        service_descriptor: ServiceDescriptor to use when constructing the
          stub class.
      """
      self.descriptor = service_descriptor
  
label_desc: Use image node_id 1 to create a new _ServiceStubBuilder object from inherited base classes: object with example: obj = _ServiceStubBuilder(service_descriptor)