feat: add getinfo()

[Ravencentric]

Pull request type

• Feature enhancement

Which ticket is resolved?

• Closes Add getinfo() method to get a single FileInfo by name #608

What does this PR change?

Implement ZipFile's getinfo
https://docs.python.org/3/library/zipfile.html#zipfile.ZipFile.getinfo

[Ravencentric]

One thing to note, getinfo accepts names ending with or without / (similar to TarFile). This allows for more interoperability with ZipFile. Do let me know if we don't want to support this. If we do want to support this, I reckon it should be done on other methods too like extract() and read() too

[miurahr]

LGTM.