JIRA: https://jira.spring.io/browse/INT-4463
Certain options, such as `maxInFlight` were not exposed.
Deprecate the setters on the factory and allow the user to inject a pre-configured
`MqttConnectOptions`, thus making all (and any new) properties available to be
configured.
# Conflicts:
# spring-integration-mqtt/src/test/java/org/springframework/integration/mqtt/MqttAdapterTests.java
48e8b14475