It would be useful to have a function that uses the Access protocol to
delete elements within nested data structures. This is similar in concept
to Kernel.pop_in/2 <https://hexdocs.pm/elixir/Kernel.html#pop_in/2>, but
Kernel.delete_in/2 should just return the data structure without the
specified element, whereas Kernel.pop_in/2 returns a tuple whose first
element is the removed value and second element is the data structure
without the specified element. The return structure of
Kernel.delete_in/2 would allow it to be more easily chained than
Kernel.pop_in/2.
Expected behavior
Kernel.delete_in(%{foo: "bar", baz: "qux"}, [:foo])
#=> %{baz: "qux"}
Kernel.delete_in(%{foo: %{bar: "baz", qux: "quux"}}, [:foo, :qux])
#=> %{foo: %{bar: "baz"}}
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