Support external kernels (#1305) #2276

Job	Run time
check_release	1m 12s
Check Links	4m 13s
build (ubuntu-latest, 3.8)	6m 55s
build (ubuntu-latest, 3.11)	7m 5s
build (windows-latest, 3.8)	4m 38s
build (windows-latest, 3.11)	6m 51s
build (macos-latest, 3.8)	1s
build (macos-latest, 3.11)	1s
build (windows-latest, 3.9)	4m 10s
build (ubuntu-latest, pypy-3.8)	8m 6s
build (macos-latest, 3.10)	1s
build (ubuntu-latest, 3.12)	8m 25s
integration_check (ubuntu-latest, 3.8)	1s
integration_check (ubuntu-latest, 3.9)	1s
integration_check (ubuntu-latest, 3.10)	2m 47s
integration_check (ubuntu-latest, 3.11)	1s
integration_check_pypy	1s
Make SDist	1s
Test Docs	1s
Test Examples	1s
Test Lint	1s
Test Minimum Versions	1s
Test Prereleases	1s
Install from SDist and Test	1s
coverage	1s
tests_check	2s
	54m 39s

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