[ska2704]

Fixes #1679.

SFTP info() always follows symlinks, so it cannot return the link metadata shown by a detailed directory listing or inspect a dangling link. Add follow_symlinks=False to use Paramiko's lstat(). The default remains True, preserving existing behavior.

Regression tests cover links to files, directories and missing targets, with bare paths and both SFTP/SSH URL schemes. They compare link metadata with ls(detail=True) and check that regular paths and the default behavior are unchanged. The option is included in the API documentation and changelog.

Validation on Python 3.12:

• Unchanged SFTP module: 11 passed, 17 skipped. All nine new regression cases fail before the change and pass with it.
• SFTP, local filesystem, filesystem specification, core and API tests: 664 passed, 108 skipped, 2 xfailed.
• pre-commit run --all-files: passed.
• sphinx-build -b html -W --keep-going docs/source ../fsspec-docs: passed.
• An additional local integration check passed using real Paramiko SSH/SFTP clients and a Paramiko SFTP server over a socket pair, with actual file, directory and dangling symlinks.

The existing 17 Docker-based SFTP tests were skipped because Docker is unavailable locally. Other skips cover optional backends and platform-specific cases. Windows and the full optional-backend suite were not run locally.