Add freelists for PyComplex, PyInt, PyRange by youknowone · Pull Request #7345 · RustPython/RustPython

* Add freelists for PyComplex, PyInt, PyBoundMethod, PyRange

- PyComplex(100), PyInt(100), PyBoundMethod(20), PyRange(6)
- Use try_with instead of with in all freelist push/pop to prevent
  panic on thread-local access during thread teardown

* Use alloc::dealloc in FreeList::Drop to avoid thread-local access panic

During thread teardown, Box::from_raw triggers cascading destructors
that may access already-destroyed thread-local storage (GC state, other
freelists). Use raw dealloc instead to free memory without running
destructors.

* Auto-format: cargo fmt --all

* Fix clippy: use core::alloc::Layout instead of alloc::alloc::Layout

* Address review: PyBoundMethod clear=false, update FreeList doc comment

- Set clear=false on PyBoundMethod (tp_clear=NULL in classobject.c)
- Update FreeList doc comment to match actual Drop behavior (raw dealloc)

* Remove PyBoundMethod freelist to fix refcount/weakref test failures

Non-Option PyObjectRef fields retain references in freelist, causing
weakref and refcount assertions to fail in test_unittest, test_multiprocessing,
and test_socket.

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