[FEATURE] Enable transaction coordinator by default

[BewareMyPower]

Is your feature request related to a problem? Please describe.
Currently KoP disables the transaction coordinator by default. However, the idempotent producer feature depends on it. Since Kafka client 3.2.0, the idempotent producer is enabled by default. So if KoP users don't configure kafkaTransactionEnabled=true, the producers might fail to produce.

Describe the solution you'd like
Enable transaction coordinator by default, and document the required configurations for old version users.

[NiuBlibing]

Is kafkaTransactionCoordinatorEnabled same as kafkaTransactionEnabled?

[BewareMyPower]

Yes, it's a typo by me