pathlib ABCs: prune PathBase interface

[barneygale]

It's time to make some difficult decisions about which methods deserve to stay in the pathlib._abc.PathBase interface, and which ought to be made pathlib.Path-only. Guidelines:

• Compare to zipfile.Path and os.DirEntry; don't evict shared methods.
• Include abstract methods only for the most basic functionality common to all virtual filesystems
• Include concrete methods only when they combine abstract methods to produce widely useful functionality

Linked PRs

• GH-127381: pathlib ABCs: remove PathBase.lstat() #127382
• GH-127381: pathlib ABCs: remove PathBase.cwd() and home() #127427
• GH-127381: pathlib ABCs: remove PathBase.rename() and replace() #127658
• GH-127381: pathlib ABCs: remove PathBase.resolve() and absolute() #127707
• GH-127381: pathlib ABCs: remove PathBase.unlink() and rmdir() #127736
• GH-127381: pathlib ABCs: remove PathBase.samefile() and rarer is_*() #127709
• GH-127381: pathlib ABCs: remove remaining uncommon PathBase methods #127714
• GH-127381: pathlib ABCs: remove uncommon PurePathBase methods #127853
• GH-127381: pathlib ABCs: remove PathBase.stat() #128334
• GH-127381: pathlib ABCs: remove PathBase.move() and move_into() #128337
• GH-127381: pathlib ABCs: remove JoinablePath.match() #129147
• GH-127381: pathlib ABCs: remove ReadablePath.rglob() #130207
• GH-127381: pathlib ABCs: remove ReadablePath.exists() and is_*() #130520
• GH-127381: pathlib ABCs: remove WritablePath.mkdir() arguments #130611
• GH-127381: pathlib ABCs: remove case_sensitive argument #131024