Add `MultiProducerSingleConsumerChannel` #3

Job	Run time
Test / Windows (5.9 - windows-2022)	14m 44s
Test / Linux (5.8 - jammy)	44s
Test / Windows (6.0 - windows-2022)	14m 36s
Test / Linux (5.9 - jammy)	48s
Test / Windows (nightly - windows-2019)	11m 12s
Test / Linux (5.10 - jammy)	43s
Test / Windows (nightly-6.1 - windows-2019)	11m 0s
Test / Linux (6.0 - jammy)	51s
Test / Linux (nightly-main - jammy)	1m 2s
Test / Linux (nightly-6.1 - jammy)	1m 2s
Soundness / API breakage check	53s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	1m 6s
Soundness / Format check	32s
Soundness / License headers check	6s
Soundness / Python lint check	3s
Soundness / Shell check	35s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	2s
	1h 0m 4s

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