fs: support io_uring in fs::metadata (statx) #7616
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Add io-uring version of fs::metadata. The tricky part here is that there is no way to construct std::fs::Metadata from libc::statx outside of std, so had to add ugly hack with shim:
So on completion I call std::fs:metadata to construct std::fs::Metadata type out of intercepted statx syscall.
And also noticed that fs_uring tests are flakky because one of the tests specifically requests too many files interfiring with other tests.