Support custom SASL mechanisms including AWS MSK #142

Job	Run time
📦 Build the source distribution	20s
Tests for Kafka 0.9.0.1 (Python 3.12)	3m 58s
📦 Publish to PyPI	0s
Tests for Kafka 0.10.2.2 (Python 3.12)	5m 5s
Tests on 3.8	7m 30s
Tests for Kafka 0.11.0.2 (Python 3.12)	6m 41s
Tests on 3.9	8m 29s
Tests for Kafka 0.11.0.3 (Python 3.12)	6m 24s
Tests on 3.10	10m 49s
Tests for Kafka 1.1.1 (Python 3.12)	8m 26s
Tests on 3.11	7m 8s
Tests for Kafka 2.4.0 (Python 3.12)	8m 7s
Tests on 3.12	7m 43s
Tests for Kafka 2.5.0 (Python 3.12)	8m 50s
Tests on pypy3.9	7m 31s
Tests for Kafka 2.6.0 (Python 3.12)	9m 9s
Tests for Kafka 0.8.2.2 (Python 3.12)	10m 16s
Tests for Kafka 0.8.2.2 (Python 3.10)	3m 16s
✅ Ensure the required checks passing	2s
	1h 59m 44s

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