improve path traversal error msg of oras pull

[qweeah]

If path of artifact blobs are absolute and needs to be pulled outside of current working directory, by default oras pull will be terminated with error like path traversal disallowed

Need to advise user action for this specific error, like Use pull with option -T/allow-path-traversal to allow path traversal

Can this be added to the error message when the pull fails with "Path travel disallowed". Use pull with option -T or --allow-path-traversal to allow path traversal.

Originally posted by @suganyas in #973 (comment)

[qweeah]

@suganyas Can you help fix this issue？

[suganyas]

@qweeah I am working on this as part of PR #988

[qweeah]

completed in #988