Add AdditionalHeader handling to ReceiveMessageAsync (#295) #33

Job	Run time
build (ubuntu-latest, Release)	2m 45s
build (windows-latest, Debug)	5m 1s
build (macos-latest, Debug)	1m 18s
build (windows-latest, Release)	4m 47s
build (ubuntu-latest, Debug)	2m 49s
build (macos-latest, Release)	1m 13s
publish-coverage / publish-coverage	38s
	18m 31s

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