Commit 2023-05-23 18:30 6c2856ce

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feat: port RingTheory.FractionalIdeal (#4243)

Estimated changes

added theorem FractionalIdeal.coe_eq
added theorem FractionalIdeal.coe_mk
added theorem FractionalIdeal.ext
added theorem FractionalIdeal.map_id
added theorem FractionalIdeal.mul_le
added theorem FractionalIdeal.one_le
added def FractionalIdeal
added theorem Ideal.fg_of_isUnit
added theorem IsFractional.inf_right
added theorem IsFractional.map
added theorem IsFractional.mul
added theorem IsFractional.nsmul
added theorem IsFractional.pow
added theorem IsFractional.sup
added def IsFractional