file attributes ignored when creating new file channel

[overheadhunter]

Note that the attrs in this method are not passed down to OpenCryptoFile#newFileChannel:

https://github.com/cryptomator/cryptofs/blob/c5432f87b557408cca2a286f664ea6effbf931a6/src/main/java/org/cryptomator/cryptofs/CryptoFileSystemImpl.java#L363-L395

https://github.com/cryptomator/cryptofs/blob/c5432f87b557408cca2a286f664ea6effbf931a6/src/main/java/org/cryptomator/cryptofs/fh/OpenCryptoFile.java#L68-L111

Which leads to atomic "create and set attributes" to fail. Here is an integration test showing the problem:

import java.nio.channels.*;
import java.nio.file.*;
import java.nio.file.attribute.*;

var path = Path.of("/Volumes/foo/test.txt");
var oo = Set.of(StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW);
var attr = PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("rwxr-x---"));

var fc = FileChannel.open(path, Set.of(StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW), attr);
fc.write(java.nio.charset.StandardCharsets.UTF_8.encode("hello world"));
fc.close();