Feature request: Add “readlink” method for IO::Path for reading symlink target

[unclechu]

I would like to have an interface to read symlink’s target. There’s IO::Path::absolute but:

1. It expands the path to the absolute one which is not necessarily what I want to do in every situation. Sometimes I just want to know what exactly a symlink’s target is. To be able to distinguish a relative from an absolute one.
2. It follows all the symlinks down to the final real target. If I have a symlink like symlink-1 -> symlink-2 -> target, the target for symlink-1 is symlink-2 but .absolute returns an absolute path to target, not symlink-2.

I think you can just reuse nqp::readlink for the implementation? For now I can either make a readlink subprocess call or use this helper on top of nqp::readlink:

use nqp;
# ...
sub readlink(IO::Path:D \filePath, IO::Path :$CWD --> IO::Path:D) {
  IO::Path.new(nqp::readlink(filePath.relative), :CWD($CWD // filePath.dirname))
}

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⚠️ To keep in mind when implementing: Symlink’s target (in case it’s a relative, non-absolute path) is relative to where the symlink file is placed. So when implementing it maybe makes sense to override the CWD to the directory of the original symlink path like I did in the helper above.