Bug description

We should make sure the ClickHouse Kafka engine is configured correctly to don't DDOS Kafka in case of issues. We should make sure we have a way to configure:

• error retries, exponential backoff with jitter
• insert rate (as by going at full speed it can melt both CH and Kafka)

Environment

• PostHog Cloud
• self-hosted PostHog (ClickHouse-based), version/commit: please provide