[Merged by Bors] - refactor(data/list/count): review API, add lemmas #16736
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* add `list.countp_join`, `list.countp_map`, `list.countp_le_of_imp`, `list.countp_congr`, and `list.count_join`; * add `@[simp]` attrs to `list.countp_eq_zero`, `list.countp_eq_length`, `list.count_eq_zero`, and `list.count_eq_length`; * golf the proofs of `list.count_bind`, `list.count_map_of_injective`, and `list.count_le_count_map`.
fpvandoorn
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Oct 3, 2022
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* add `list.countp_join`, `list.countp_map`, `list.countp_mono_left`, `list.countp_congr`, and `list.count_join`; * add `@[simp]` attrs to `list.countp_eq_zero`, `list.countp_eq_length`, `list.count_eq_zero`, and `list.count_eq_length`; * golf the proofs of `list.count_bind`, `list.count_map_of_injective`, and `list.count_le_count_map`.
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list.countp_join,list.countp_map,list.countp_mono_left,list.countp_congr, andlist.count_join;@[simp]attrs tolist.countp_eq_zero,list.countp_eq_length,list.count_eq_zero, andlist.count_eq_length;list.count_bind,list.count_map_of_injective,and
list.count_le_count_map.