feat: add Int.emod_sub_emod and Int.sub_emod_emod
#6507
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This PR adds the subtraction equivalents for `Int.emod_add_emod` (`(a % n + b) % n = (a + b) % n`) and `Int.add_emod_emod` (`(a + b % n) % n = (a + b) % n`). These are marked @[simp] like their addition equivalents. Discussed on Zulip in https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Adding.20some.20sub_emod.20lemmas.20to.20DivModLemmas
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This PR adds the subtraction equivalents for
Int.emod_add_emod((a % n + b) % n = (a + b) % n) andInt.add_emod_emod((a + b % n) % n = (a + b) % n). These are marked @[simp] like their addition equivalents.Discussed on Zulip in
https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Adding.20some.20sub_emod.20lemmas.20to.20DivModLemmas