Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-12-23 22:35 720fa8fa

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feat(data/rat/basic): API around rat.mk (#10782)

Estimated changes

added theorem rat.denom_mk
added theorem rat.ext
added theorem rat.ext_iff
added theorem rat.mk_neg_denom
added theorem rat.num_mk