Split out from #15714.

Relevant Python 3.15 changes:

• Added collections.Counter symmetric difference operators (CPython PR: Add symmetric_difference to Counter cpython#138682; source: https://github.com/python/cpython/blob/main/Lib/collections/__init__.py)
• Added _interpqueues.create(maxsize, unboundop=-1, fallback=-1) and _interpqueues.put(qid, obj, unboundop=-1, fallback=-1) signatures (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Modules/_interpqueuesmodule.c)
• Added sys.abi_info and lazy import configuration APIs (CPython PRs: Implement PEP 810 – Explicit lazy imports cpython#142349, gh-133143: Make information about the interpreter ABI more accessible cpython#137476; source: https://github.com/python/cpython/blob/main/Python/sysmodule.c)
• Added timeit.Timer.autorange(target_time=...) (CPython PR: timeit: Additional changes for autorange cpython#80642; source: https://github.com/python/cpython/blob/main/Lib/timeit.py)
• Added threading.serialize_iterator, threading.synchronized_iterator, and threading.concurrent_tee (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/threading.py)
• Added types.FrameLocalsProxyType, types.LazyImportType, 3.15 FrameType.f_locals, and generator/coroutine state properties (gi_state, cr_state, ag_state); removed CodeType.co_lnotab for 3.15 (CPython PR: Remove deprecated co_lnotab from CodeType cpython#134690; source: https://github.com/python/cpython/blob/main/Objects/frameobject.c, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Objects/genobject.c)
• Added xml.is_valid_name and xml.is_valid_text (CPython PR: Add utility functions to test for legal XML characters and names cpython#139489; source: https://github.com/python/cpython/blob/main/Lib/xml/__init__.py)