Add tool to help with "bootstraping" build #5874

Job	Run time
collateral (diffcov)	5m 39s
test (3.9, ubuntu-latest)	4m 22s
collateral (docs)	1m 48s
test_cygwin (39, windows-latest)	16m 44s
test (3.9, macos-latest)	3m 49s
test (3.9, windows-latest)	13m 30s
test (3.13, ubuntu-latest)	5m 6s
test (3.13, macos-latest)	4m 14s
test (3.13, windows-latest)	11m 14s
test (3.10, ubuntu-latest)	4m 18s
test (3.11, ubuntu-latest)	4m 9s
test (3.12, ubuntu-latest)	5m 42s
test (3.14, ubuntu-latest)	6m 34s
test (pypy3.10, ubuntu-latest, stdlib)	17m 7s
test (ubuntu-latest, 3.10, stdlib)	4m 11s
integration-test	0s
check	2s
release	0s
	1h 48m 29s

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