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feat(measure_theory/outer_measure): golf, add lemmas (#6664)
* `Union_of_tendsto_zero`, `Union_nat_of_monotone_of_tsum_ne_top`, `of_function_union_of_separated`: supporting lemmas for the upcoming definition of the Hausdorff measure (and more generally metric outer measures). * `ext_nonempty`, `smul_supr`, `map_sup`, `map_supr`, `comap_supr`, `restrict_univ`, `restrict_empty`, `restrict_supr`, `map_comap`, `map_comap_le`, `map_comap_of_surjective`, `restrict_le_self`, `map_le_restrict_range`, `le_comap_map`, `comap_map`, `comap_top`, `top_apply'`, `map_top`, `map_top_of_surjective`: new API lemmas about `map`/`comap`/`restrict` and `sup`/`supr`/`top`; * `is_greatest_of_function`, `of_function_eq_Sup`, `comap_of_function`, `map_of_function_le`, `map_of_function`, restrict_of_function`, `smul_of_function`: new lemmas about `of_function`; * `Inf_apply'`: a version of `Inf_apply` that assumes that another set is nonempty; * `infi_apply`, `infi_apply'`, `binfi_apply`, `binfi_apply'`, `map_infi_le`, `comap_infi`, `map_infi`, `map_infi_comap`, `map_binfi_comap`, `restrict_infi_restrict`, `restrict_infi`, `restrict_binfi`: new lemmas about `map`/`comap`/`restrict` and `Inf`/`infi`; * `extend_congr`: `infi_congr_Prop` specialized for `extend`; why this is not a `congr` lemma? * `le_induced_outer_measure`: `le_of_function` for `induced_outer_measure`; * `trim_le_trim` → `trim_mono`: rename, use `monotone`; * `exists_measurable_superset_forall_eq_trim`: a version of `exists_measurable_superset_eq_trim` that works for countable families of measures; * `trim_binop`, `trim_op`: new helper lemmas to golf `trim_add` etc; * `trim_sup`, `trim_supr`: new lemmas about `trim`. * `map_mono`, `comap_mono`, `mono''`, `restrict_mono`, `trim_mono`: `@[mono]` lemmas.
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