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feat(algebra/pointwise): more lemmas about pointwise actions (#9226)
This: * Primes the existing lemmas about `group_with_zero` and adds their group counterparts * Adds: * `smul_mem_smul_set_iff` * `set_smul_subset_set_smul_iff` * `set_smul_subset_iff` * `subset_set_smul_iff` * Generalizes `zero_smul_set` to take weaker typeclasses
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