[Merged by Bors] - feat(data/real/ennreal,topology/*): assorted lemmas #6663
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@[simp]
toennreal.coe_nat_lt_coe_nat
andennreal.coe_nat_le_coe_nat
;ennreal.le_of_add_le_add_right
;set.nonempty.preimage
;ennreal.infi_mul_left'
andennreal.infi_mul_right'
;ennreal.tsum_top
;emetric.diam_closure
;edist_pos
;isometric.bijective
,isometric.injective
, andisometric.surjective
.