Instructions

Tadhg has found the perfect Erlang library to help with his project. Being an older Erlang library it is using the gb_trees module rather than the newer maps module for storing data.

Help out Tadgh by creating external types and functions for working with gb_trees in Gleam.

1. Define the GbTree external type

The GbTree type should have two type parameters, a key type and a value type. It should have no constructors, making it an external type.

2. Define the new_gb_tree function

The new_gb_tree function should take no arguments and return an empty GbTree.

It should use the gb_trees:empty/0 function from the Erlang standard library.

3. Define the insert function

The insert function should take a GbTree and a key and value to insert into the tree. It should return a new GbTree with the key and value inserted.

The function should take three arguments:

1. The GbTree to insert into.
2. The key to insert.
3. The value to insert.

It should use the gb_trees:insert/3 function from the Erlang standard library.

4. Define the delete function

The delete function should take a GbTree and a key to delete from the tree. It should return a new GbTree with the key and value deleted.

The function should take two arguments:

1. The GbTree to delete from.
2. The key to delete.

It should use the gb_trees:delete_any/2 function from the Erlang standard library.