Add `MultiProducerSingleConsumerChannel` #10

Job	Run time
Test / Windows (5.9 - windows-2022)	13m 57s
Test / Linux (5.8 - jammy)	50s
Test / Windows (6.0 - windows-2022)	11m 1s
Test / Linux (5.9 - jammy)	54s
Test / Windows (nightly - windows-2019)	11m 24s
Test / Linux (5.10 - jammy)	54s
Test / Windows (nightly-6.1 - windows-2019)	11m 9s
Test / Linux (6.0 - jammy)	1m 7s
Test / Linux (nightly-main - jammy)	1m 28s
Test / Linux (nightly-6.1 - jammy)	1m 27s
Soundness / API breakage check	1m 22s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	1m 8s
Soundness / Format check	38s
Soundness / License headers check	3s
Soundness / Python lint check	6s
Soundness / Shell check	34s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	3s
	58m 10s

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