Faster `TableFactor::toDecisionTreeFactor` #3403

Job	Run time
ubuntu-20.04-gcc-9 Release Python 3	18m 19s
ubuntu-20.04-clang-9 Release Python 3	17m 44s
macos-13-xcode-14.2 Release Python 3	19m 45s
macos-14-xcode-15.4 Release Python 3	9m 23s
windows-2022-msbuild Release Python 3	31m 59s
	1h 37m 10s

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