Add `MultiProducerSingleConsumerChannel` #4

Job	Run time
Test / Linux (5.8 - jammy)	44s
Test / Windows (5.9 - windows-2022)	13m 7s
Test / Linux (5.9 - jammy)	46s
Test / Windows (6.0 - windows-2022)	14m 51s
Test / Linux (5.10 - jammy)	46s
Test / Windows (nightly - windows-2019)	11m 8s
Test / Linux (6.0 - jammy)	52s
Test / Windows (nightly-6.1 - windows-2019)	10m 47s
Test / Linux (nightly-main - jammy)	1m 1s
Test / Linux (nightly-6.1 - jammy)	1m 1s
Soundness / API breakage check	55s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	1m 10s
Soundness / Format check	34s
Soundness / License headers check	8s
Soundness / Python lint check	5s
Soundness / Shell check	35s
Soundness / Unacceptable language check	7s
Soundness / YAML lint check	4s
	58m 43s

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