file metadata api compatible with glibc 2.28 below

**Is your feature request related to a problem? Please describe.** A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] currently monoio 0.2.4 cannot run below debian10 whic glibc is below 2.28, because file metadata api uses `statx` <img width="1220" height="456" alt="Image" src="https://github.com/user-attachments/assets/fa04b425-08fc-4983-b059-f2fdcf2914b9" /> **Describe the solution you'd like** A clear and concise description of what you want to happen. use `fstatat64` if `statx` is not found **Describe alternatives you've considered** A clear and concise description of any alternative solutions or features you've considered. **Additional context** Add any other context or screenshots about the feature request here.