Add support for 'none' authentication for kafka while still allowing SSL

[Kilowhisky]

PR for #705.

I've confirmed it working against my companies AWS MSK cluster.

{ "time": "2023-09-08 16:18:19.7048", "level": "Error", "message": "[sarama] Initializing new client" }
{ "time": "2023-09-08 16:18:19.7048", "level": "Error", "message": "[sarama] ClientID is the default of 'sarama', you should consider setting it to something application-specific." }
{ "time": "2023-09-08 16:18:19.7048", "level": "Error", "message": "[sarama] ClientID is the default of 'sarama', you should consider setting it to something application-specific." }
{ "time": "2023-09-08 16:18:19.7048", "level": "Error", "message": "[sarama] client/metadata fetching metadata for all topics from broker b-1.dev-lab.jredk1.c13.kafka.us-west-2.amazonaws.com:9094" }
{ "time": "2023-09-08 16:18:19.7054", "level": "Error", "message": "[sarama] Connected to broker at b-1.dev-lab.jredk1.c13.kafka.us-west-2.amazonaws.com:9094 (unregistered)" }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] client/brokers registered new broker #2 at b-2.dev-lab.jredk1.c13.kafka.us-west-2.amazonaws.com:9094" }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] client/brokers registered new broker #1 at b-1.dev-lab.jredk1.c13.kafka.us-west-2.amazonaws.com:9094" }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] Successfully initialized new client" }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] ClientID is the default of 'sarama', you should consider setting it to something application-specific." }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] producer/broker/1 starting up" }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] producer/broker/1 state change to [open] on core-geofence.private-triggered/7" }
{ "time": "2023-09-08 16:18:19.7137", "level": "Error", "message": "[sarama] Connected to broker at b-1.dev-lab.jredk1.c13.kafka.us-west-2.amazonaws.com:9094 (registered as #1)" }
{ "time": "2023-09-08 16:18:19.7654", "level": "Debug", "message": "Endpoint send ok: 107: kafka://b-1.dev-lab.jredk1.c13.kafka.us-west-2.amazonaws.com:9094/core-geofence.private-triggered?auth=none&ssl=true: <nil>" }