Replace hardcoded expected values for linkCount and size with range checks
(>=1 and >0 respectively) so the test passes across different filesystems
that may report varying directory metadata.
Add a new `File.stat(path)` static method that returns a `Stat` object with low-level file system metadata for both files and directories. Include a test file `stat_static_directory.wren` that validates the returned `Stat` object's type and field types (device, inode, mode, linkCount, user, group, specialDevice, size, blockSize, blockCount) against a known test directory.