Builds an association by mapping a function over a list of keys.
AssociationMap[f, {key1, key2, …}]
AssociationMap[f, <| key1 -> val1, key2 -> val2, … |>]
AssociationMap[f]
AssociationMap[f, {a, b, c}]
→ <|a -> f[a], b -> f[b], c -> f[c]|>AssociationMap[f][{a, b, c}]
→ <|a -> f[a], b -> f[b], c -> f[c]|>