code: public EndpointSendConfiguration withContext(java.util.Map<String, String> context) {
          setContext(context);
          return this;
      }
docs: A map of custom attributes to attributes to be attached to the message for this address. This payload is added to
  the push notification's 'data.pinpoint' object or added to the email/sms delivery receipt event attributes.
  
  @param context
  A map of custom attributes to attributes to be attached to the message for this address. This payload is
  added to the push notification's 'data.pinpoint' object or added to the email/sms delivery receipt event
  attributes.
  @return Returns a reference to this object so that method calls can be chained together.