Implement b2 file unhide command

[adil-reef]

Implement b2 file unhide command

[mjurbanski-reef]

seems like there was oversight on our part an we did not update b2 file hide to use B2URI when doing b2v4

Please correct our mistake, i.e.:

• in this command only support b2uri argument
• in b2 file hide support both new and old syntax, but the --help should be only speaking of new syntax
• the b2v3 hide-file should remain unchanged

[mjurbanski-reef]

Suggested change

	class B2URIFileOrBucketNameArgMixin:
	class B2URIFileOrBucketNameFileNameArgMixin:

and move

def _setup_parser(cls, parser):
        parser.add_argument(
            'fileName', nargs='?', help=argparse.SUPPRESS
        )

in here as well

and drop completer - it will simply not work properly since the first argument will be completed using B2 URI completer

and I guess we have no need for add_b2id_or_file_like_b2_uri_or_bucket_name_argument

I don't know any command that takes either B2URI or plain bucketName, in general we are pushing towards using B2 URI always.

[mjurbanski-reef]

please create a new unit test that check just legacy syntax since it is rather complex right now to determine whenever the "fileCount": 28, is correct or not and mixing more cases in single tests makes it even more complex

That test can simply create a file, execute legacy hide command and check if the is indeed hidden