Suggest expression changes that create better patterns

[zachallaun]

Mneme currently only produces patterns for the returned value, but there are situations where the value doesn’t produce a desired pattern. MapSet comes to mind. For example, this match pattern is invalid:

MapSet.new([1, 2, 3]) = MapSet.new([1, 2, 3])

# would have to be something like
%MapSet{…} = MapSet.new(…)

These cases could be identified and simple transformations offered as suggestions. For example:

auto_assert some_set()

# could suggest
auto_assert [1, 2, 3] <- some_set() |> MapSet.to_list()