Add "debug initializer" hook for channels #46

Job	Run time
Unit tests / Construct unit test matrix	3s
Cxx interop / Construct Cxx interop matrix	3s
Soundness / API breakage check	3m 30s
Soundness / Documentation check	2m 36s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	9s
Soundness / Format check	42s
Soundness / License headers check	4s
Soundness / Python lint check	7s
Soundness / Shell check	48s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	2m 7s
Cxx interop / Cxx interop / Linux (5.10)	2m 7s
Cxx interop / Cxx interop / Linux (6.0)	2m 23s
Cxx interop / Cxx interop / Linux (nightly-6.1)	2m 47s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 58s
Unit tests / Unit tests / Linux (5.9)	4m 15s
Unit tests / Unit tests / Linux (5.10)	4m 21s
Unit tests / Unit tests / Linux (6.0)	4m 33s
Unit tests / Unit tests / Linux (nightly-6.1)	5m 0s
Unit tests / Unit tests / Linux (nightly-main)	5m 9s
	43m 48s

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