Add "debug initializer" hook for channels #102

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	4m 7s
Soundness / Documentation check	2m 51s
Soundness / License headers check	5s
Soundness / Broken symlinks check	3s
Soundness / Format check	44s
Soundness / Python lint check	5s
Soundness / Shell check	33s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	2s
Static SDK / Static SDK / Linux (latest-release Jammy)	35s
Static SDK / Static SDK / Linux (main Jammy)	4m 23s
Cxx interop / Cxx interop / Linux (5.9)	2m 21s
Cxx interop / Cxx interop / Linux (5.10)	2m 29s
Cxx interop / Cxx interop / Linux (6.0)	2m 48s
Cxx interop / Cxx interop / Linux (nightly-next)	3m 28s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 31s
Unit tests / Unit tests / Linux (5.9)	4m 36s
Unit tests / Unit tests / Linux (5.10)	4m 38s
Unit tests / Unit tests / Linux (6.0)	5m 4s
Unit tests / Unit tests / Linux (nightly-next)	5m 37s
Unit tests / Unit tests / Linux (nightly-main)	5m 44s
	53m 51s

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