Support S3FileSystemProvider.copy(...) for directories

[ennoruijters]

Task Description

FileSystemProvider.copy(Path, Path, CopyOption ...) for directories is documented by Java (via Files.copy(Path, Path, CopyOption[]) as:

If the file is a directory then it creates an empty directory in the target location (entries in the directory are not copied).

The current S3FileSystemProvider just throws an exception stating that is is not yet implemented, I propose to implement it.

Tasks

The following tasks will need to be carried out:

• S3FileSystemProvider.copy(Path, Path, CopyOption...) should copy directories non-recursively, as documented by Java.
• Include unit tests.

Task Relationships

This task:

• Relates to: Implement support for copying directories recursively #160.

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