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)

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉