Lint

Add switchable HTTP transports #1234

Job	Run time
build (3.13, windows-latest, manual)	1m 12s
build (3.13, windows-latest, pre-commit)	1m 20s
build (3.13, windows-latest, pre-push)	2m 29s
build (3.13, ubuntu-latest, manual)	38s
build (3.13, ubuntu-latest, pre-commit)	36s
build (3.13, ubuntu-latest, pre-push)	1m 13s
completion-lint	2s
	7m 30s

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