Add User Properties to CONNECT packet for MQTT 3.1.1

[alfianlosari]

MQTTClientFramework had already passing userProperties dictionary for MQTT Protocol 5 For this MR, i added several implementations:

• Accept userProperties optional dictionary in ConnectOptions initializer, this can be user by the public to provide their properties.
• Update MQTTMessage.m in MQTTCF to also inject userProperties 0x26/38 for MQTT Protocol 3.1.1.