Confluent-kafka-helpers

Minor:
- Update default consumer and producer configs (51)

Fixes:
- Use existing signal handlers if they exist (50)
- Refactor DataDog metrics in the statistics callback (43)

Fixes:
- Don't raise `SystemExit` in signal handlers (https://github.com/fyndiq/confluent_kafka_helpers/pull/47)

Minor:
- Set default `auto.offset.reset` to `earliest` (https://github.com/fyndiq/confluent_kafka_helpers/pull/48)

Fixes:
- Decode Kafka message headers (https://github.com/fyndiq/confluent_kafka_helpers/pull/45)

Minor:
- Add Kafka headers to message metadata (https://github.com/fyndiq/confluent_kafka_helpers/pull/44)
- Enable producer idempotency by default (https://github.com/fyndiq/confluent_kafka_helpers/pull/42)
- Raise exceptions on Kafka errors instead of just logging them (https://github.com/fyndiq/confluent_kafka_helpers/pull/41)

Fixes:
- Revise and update default values for producer and consumer (https://github.com/fyndiq/confluent_kafka_helpers/pull/37)
- Pin `confluent_kafka` to 1.3.0
- CI/CD pipeline fixes (https://github.com/fyndiq/confluent_kafka_helpers/pull/39)