Add `MultiProducerSingleConsumerChannel` #5

Job	Run time
Test / Linux (5.8 - jammy)	40s
Test / Windows (5.9 - windows-2022)	13m 22s
Test / Linux (5.9 - jammy)	45s
Test / Windows (6.0 - windows-2022)	15m 37s
Test / Linux (5.10 - jammy)	48s
Test / Windows (nightly - windows-2019)	11m 56s
Test / Linux (6.0 - jammy)	57s
Test / Windows (nightly-6.1 - windows-2019)	10m 45s
Test / Linux (nightly-main - jammy)	1m 26s
Test / Linux (nightly-6.1 - jammy)	1m 27s
Soundness / API breakage check	53s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	1m 10s
Soundness / Format check	40s
Soundness / License headers check	5s
Soundness / Python lint check	9s
Soundness / Shell check	31s
Soundness / Unacceptable language check	7s
Soundness / YAML lint check	6s
	1h 1m 27s

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