Add support for folding imports in python #605

Job	Run time
test (ubuntu-latest, 27.2, false)	43s
test (ubuntu-latest, 28.2, false)	39s
test (ubuntu-latest, 29.4, false)	1m 26s
test (macos-latest, 28.2, false)	1m 32s
test (macos-latest, 29.4, false)	1m 45s
test (windows-latest, 27.2, false)	2m 26s
test (windows-latest, 28.2, false)	1m 11s
test (windows-latest, 29.4, false)	1m 33s
test (ubuntu-latest, snapshot, true)	34s
test (macos-latest, snapshot, true)	1m 31s
test (windows-latest, snapshot, true)	1m 30s
	14m 50s

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