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Add headers to `KafkaAcknowledgedMessage` (#179) #9

Job	Run time
Unit tests / Unit tests (swift:5.9-jammy, 5.9, true)	3m 16s
Unit tests / Unit tests (swift:5.10-jammy, 5.10, true)	3m 23s
Unit tests / Unit tests (swift:6.0-jammy, 6.0, true)	5m 4s
Unit tests / Unit tests (swiftlang/swift:nightly-6.0-jammy, nightly-6.0, true)	5m 23s
Unit tests / Unit tests (swiftlang/swift:nightly-main-jammy, nightly-main, true)	3m 59s
	21m 5s

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