Add `MultiProducerSingleConsumerChannel` #16

Job	Run time
Test / Linux (5.9 - jammy)	58s
Test / Windows (5.9 - windows-2022)	17m 9s
Test / Linux (5.10 - jammy)	1m 2s
Test / Windows (6.0 - windows-2022)	7m 46s
Test / Linux (6.0 - jammy)	1m 9s
Test / Windows (6.1 - windows-2022)	18m 56s
Test / Linux (6.1 - jammy)	1m 16s
Test / Windows (nightly - windows-2019)	11m 25s
Test / Linux (nightly-main - jammy)	1m 24s
Test / Windows (nightly-6.1 - windows-2019)	11m 25s
Test / Linux (nightly-6.1 - jammy)	1m 29s
Soundness / Documentation check	1m 17s
Soundness / Broken symlinks check	4s
Soundness / API breakage check	1m 20s
Soundness / Format check	41s
Soundness / License headers check	3s
Soundness / Python lint check	6s
Soundness / Shell check	33s
Soundness / Unacceptable language check	5s
Soundness / YAML lint check	5s
	1h 18m 13s

Provide feedback