feat(data/finset/basic): add to_list_insert and to_list_cons (#10840)
feat(data/finset/basic): add to_list_insert and to_list_cons (#10840)




Co-authored-by: Eric Wieser <da64e90baec5d084ce3d8e05f3b022ae6d118ff5@gmail.com>

leanprover-community/mathlib,leanprover-community/mathlib