Add `MultiProducerSingleConsumerChannel` #13

Job	Run time
Test / Linux (5.8 - jammy)	48s
Test / Windows (5.9 - windows-2022)	13m 18s
Test / Linux (5.9 - jammy)	57s
Test / Windows (6.0 - windows-2022)	16m 10s
Test / Linux (5.10 - jammy)	58s
Test / Windows (nightly - windows-2019)	10m 22s
Test / Linux (6.0 - jammy)	1m 10s
Test / Linux (nightly-main - jammy)	1m 29s
Test / Windows (nightly-6.1 - windows-2019)	9m 48s
Test / Linux (nightly-6.1 - jammy)	1m 23s
Soundness / API breakage check	1m 19s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	1m 8s
Soundness / Format check	35s
Soundness / Unacceptable language check	7s
Soundness / License headers check	4s
Soundness / Python lint check	4s
Soundness / Shell check	30s
Soundness / YAML lint check	5s
	1h 0m 19s

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