feat: add an extra method to (Checked)Euclid trait to get both quotien and rem

[tdelabro]

closes #290

[cuviper]

I suggested some fixes for the documentation. I would also appreciate some tests, and doc-examples are an easy way to both demonstrate the feature and test it.

I think we should drop "with" from the name, just div_rem_euclid and checked_div_rem_euclid. This will be more similar to Integer::div_rem.

[tdelabro]

@cuviper it's ready for another review

[tdelabro]

@cuviper Ready for review

[cuviper]

Thanks!

bors r+

[bors]

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