Add additional events emitted by kafka-node's Client (#22678)
Add additional events emitted by kafka-node's Client (#22678)

Previously, only KafkaClient (subclass) had signatures for `on()`.
However, Client and KafkaClient emit many of the same events.
- See https://github.com/SOHU-Co/kafka-node/blob/master/lib/client.js
  and https://github.com/SOHU-Co/kafka-node/blob/master/lib/kafkaClient.js
  (Search for the string `emit(`)

zkReconnect is exclusive to Client, and socket_connect is exclusive to
KafkaClient. TypeScript's type checker warns if I put on() declarations
in KafkaClient. (Haven't tried duplicating.)
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