add kafka connection properties to profile

[emef]

this is to support adding additional rdkafka config params when creating a kafka connection profile

[mwylde]

This would be a bit better as as map instead of a vec so that users don't need to know the k/v syntax. This is how we do property overrides on the table:

arroyo/crates/arroyo-connectors/src/kafka/table.json

Lines 83 to 90 in a9ac8f7

	"client_configs": {
	"type": "object",
	"title": "Client Configs",
	"description": "Additional Kafka configs to pass to the underlying Kafka consumer or producer. See [Kafka Consumer Configs](https://kafka.apache.org/documentation/#consumerconfigs) and [Kafka Producer Configs](https://kafka.apache.org/documentation/#producerconfigs) for more details.",
	"additionalProperties": {
	"type": "string"
	}
	},

[mattforbes-gr]

👍 agreed map is better

[mwylde]

With this change we'll be able to set client configs from both the connection and the table. I think it would be good to warn when iterating through the table configs (on 939) if both define the same property.