optree v0.18.0

Added

• Use ARM-based GHA runners to build ARM wheels by @XuehaiPan in #234.
• Add Android support by @XuehaiPan in #236.
• Add manylinux-riscv64 wheels by @XuehaiPan in #243.
• Add cp{313,314}-ios / cp{313,314}-android / cp{312,313}-pyodide wheels by @XuehaiPan in #242 and #244.
• Add support for method pair (__tree_flatten__, __tree_unflatten__) for register_pytree_node_class(cls) by @XuehaiPan in #253.

Removed

• Remove CPython 3.9/3.10 wheels for Windows ARM64 due to unavailability of official Python distribution by @XuehaiPan in #234.
• Remove previously deprecated singular-named modules in #209 by @XuehaiPan in #238.
• Remove PyPy 3.10 (EOL) wheels by @dependabot in #241.

Full Changelog: v0.17.0...v0.18.0