Make all types that implements ::num_traits::Zero implement crate::num_traits::Zero
#106
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for [AtCoder 2023/1 Language Update](https://docs.google.com/spreadsheets/d/1HXyOXt5bKwhKWXruzUvfMFHQtBxfZQ0047W7VVObnXI/edit#gid=408033513&range=I2).
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This PR depends on #102 and #105. In addition to the changes applied in the PRs, this PR has a bonus: every type that implements
::num_traits::Zeroimplementscrate::num_traits::Zerotoo. Therefore, if your crate depends onnum_traitsand have a type that implement::num_traits::Zeroand want to use it for Fenwick Tree, you can just use it without suffering. On the other hands, even fi your crate does not depend onnum_traitsbut still want to use your own type for Fenwick Tree, you can manually implementcrate::num_traits::Zero.