feat: support key encode bytes for sink

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What's changed and what's your intention?

following #16377

resolve #19240

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introducing another key encode

note that the key encode bytes just work for Kafka sink and allows only one bytea column as primary_key, keeping the same as key encode TEXT.

an example here

create sink sink_bytes_json as (
  select int8send(id) as id_bytes, * from t_kafka
) with (
  connector = 'kafka',
  properties.bootstrap.server = 'message_queue:29092',
  topic = 'test-rw-sink-bytes-key-id',
  primary_key = 'id_bytes')
format plain encode json (
  force_append_only='true'
) key encode bytes;