dm-tree: Nested Data Structure Utilities

dm-tree (DeepMind Tree) is a lightweight Python library designed for working with nested data structures such as lists, tuples, and dictionaries. It provides functional tools like `map_structure`, `flatten`, and `unflatten` to apply operations across arbitrary tree-like data. The current stable version is 0.1.10, and it follows an infrequent release cadence focused on stability for its core functionalities.