make debugger class configurable #2755

Job	Run time
test_docs	1m 5s
check_release	2m 1s
Test Lint	57s
build (ubuntu-latest, 3.9)	3m 0s
Test Minimum Versions	2m 10s
build (ubuntu-latest, 3.13)	3m 17s
test_without_debugpy (ubuntu-latest, 3.9)	1m 54s
build (windows-latest, 3.9)	9m 40s
link_check	3m 34s
build (windows-latest, 3.13)	9m 7s
Make SDist	20s
build (macos-latest, 3.9)	3m 9s
Test Prereleases	2m 19s
build (macos-latest, 3.13)	4m 45s
build (ubuntu-latest, pypy-3.9)	4m 8s
build (macos-latest, 3.10)	5m 3s
build (ubuntu-latest, 3.11)	2m 44s
build (ubuntu-latest, 3.12)	3m 17s
Install from SDist and Test	1m 56s
coverage	14s
tests_check	4s
	1h 4m 44s

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