Add Python 3.15 path HTTP and importlib updates

[JelleZijlstra]

Summary

Add Python 3.15 stdlib updates for path helpers, HTTP helpers, importlib, inspect, pydoc, pathlib, glob, and zipimport.

Relevant report entries

• Added genericpath.ALL_BUT_LAST, posixpath.ALL_BUT_LAST, and ntpath.ALL_BUT_LAST, and updated several path helpers to positional-only signatures (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/genericpath.py, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/posixpath.py, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/ntpath.py)
• Added http.client.HTTPConnection(max_response_headers=...) and HTTPSConnection(max_response_headers=...) (CPython PR: http.client._MAXHEADERS = 100 limit no longer sufficient cpython#131724; source: https://github.com/python/cpython/blob/main/Lib/http/client.py)
• Added http.server default_content_type and SimpleHTTPRequestHandler(extra_response_headers=...); removed CGIHTTPRequestHandler for 3.15 (CPython PRs: default http content-type cpython#113471, gh-135056: Add a --header CLI argument to http.server cpython#135057, Remove http.server.CGIHTTPRequestHandler and --cgi flag support cpython#133810; source: https://github.com/python/cpython/blob/main/Lib/http/server.py)
• Added inspect.getdoc(inherit_class_doc=..., fallback_to_class_doc=...) (CPython PR: Share code for getdoc() between inspect and pydoc cpython#132686; source: https://github.com/python/cpython/blob/main/Lib/inspect.py)
• Added importlib.resources.abc.Traversable.read_text(errors=...) (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/importlib/resources/abc.py)
• Removed private importlib.metadata.DeprecatedNonAbstract, kept Distribution and PathDistribution as ABCs, and updated 3.15 importlib.metadata.__all__/MetadataNotFound (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/importlib/metadata/__init__.py)
• Changed opcode.opmap to frozendict and added pathlib.PurePath.__vfspath__() for Python 3.15 (CPython sources: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/opcode.py, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/pathlib/__init__.py)
• Added pstats.Stats.print_call_subheading() and pydoc.Doc.STDLIB_DIR; changed pydoc.Doc.getdocloc(basedir=None) (CPython sources: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/pstats.py, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/pydoc.py)
• Removed glob.glob0, glob.glob1, platform.java_ver, pathlib.PurePath.is_reserved, and zipimport.zipimporter.load_module for 3.15 (sources: https://github.com/python/cpython/blob/main/Lib/glob.py, https://github.com/python/cpython/blob/main/Lib/platform.py, https://github.com/python/cpython/blob/main/Lib/pathlib/__init__.py, https://github.com/python/cpython/blob/main/Lib/zipimport.py)

[JelleZijlstra]

same

[JelleZijlstra]

Actually @srittau do you have strong opinions on how cases like this should be formatted? We have one set of slots for 3.10/3.11, another for 3.12, yet another for 3.13/3.14, and then no slots in 3.15. We could instead wrap up the whole thing in an if sys.version_info < (3, 15):, but that means the rest gets indented more.

[JelleZijlstra]

This is sort of similar. The method has been there since the beginning, deprecated since 3.13, gone in 3.15. In this case we shouldn't unconditionally mark it as deprecated, because the replacement (os.path.isreserved) is also new in 3.13.

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

pandas (https://github.com/pandas-dev/pandas)
+ pandas/core/computation/ops.py:328: error: Need type annotation for "_binary_ops_dict" (hint: "_binary_ops_dict: dict[<type>, <type>] = ...")  [var-annotated]