Support custom SASL mechanisms including AWS MSK #141

Job	Run time
📦 Build the source distribution	24s
Tests on 3.8	10m 36s
📦 Publish to PyPI	0s
Tests on 3.9	9m 50s
Tests for Kafka 0.9.0.1 (Python 3.12)	4m 33s
Tests on 3.10	8m 8s
Tests for Kafka 0.10.2.2 (Python 3.12)	5m 37s
Tests on 3.11	8m 11s
Tests for Kafka 0.11.0.2 (Python 3.12)	6m 10s
Tests for Kafka 0.11.0.3 (Python 3.12)	6m 13s
Tests on 3.12	7m 57s
Tests for Kafka 1.1.1 (Python 3.12)	10m 7s
Tests on pypy3.9	8m 21s
Tests for Kafka 2.4.0 (Python 3.12)	8m 5s
Tests for Kafka 2.5.0 (Python 3.12)	8m 4s
Tests for Kafka 2.6.0 (Python 3.12)	9m 35s
Tests for Kafka 0.8.2.2 (Python 3.12)	10m 16s
Tests for Kafka 0.8.2.2 (Python 3.10)	3m 21s
✅ Ensure the required checks passing	10s
	2h 5m 38s

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