Add method to compute integer roots #269

Job	Run time
Install from git checkout on Ubuntu	10m 43s
Install from PyPI sdist on Ubuntu	8m 20s
Build wheels for ubuntu-20.04	18m 2s
Build wheels for windows-2019	41m 48s
Build wheels for macos-12	21m 7s
Build sdist	34s
Test 3.9 wheel on ubuntu-20.04	1m 7s
Test 3.10 wheel on ubuntu-20.04	1m 11s
Test 3.11 wheel on ubuntu-20.04	1m 23s
Test 3.9 wheel on windows-2019	2m 4s
Test 3.10 wheel on windows-2019	1m 23s
Test 3.11 wheel on windows-2019	1m 45s
Test 3.9 wheel on macos-12	1m 30s
Test 3.10 wheel on macos-12	1m 57s
Test 3.11 wheel on macos-12	1m 23s
	1h 54m 17s

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