Add "debug initializer" hook for channels #49

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	3s
Soundness / Documentation check	2m 24s
Soundness / License headers check	4s
Soundness / API breakage check	3m 21s
Soundness / Broken symlinks check	5s
Soundness / Format check	38s
Soundness / Shell check	29s
Soundness / Unacceptable language check	2s
Soundness / Python lint check	6s
Soundness / YAML lint check	4s
Unit tests / Unit tests / Linux (5.9)	4m 17s
Unit tests / Unit tests / Linux (5.10)	4m 14s
Unit tests / Unit tests / Linux (6.0)	4m 39s
Unit tests / Unit tests / Linux (nightly-6.1)	5m 4s
Unit tests / Unit tests / Linux (nightly-main)	5m 3s
Cxx interop / Cxx interop / Linux (5.9)	2m 10s
Cxx interop / Cxx interop / Linux (5.10)	2m 0s
Cxx interop / Cxx interop / Linux (6.0)	2m 14s
Cxx interop / Cxx interop / Linux (nightly-6.1)	2m 54s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 51s
	42m 44s

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