Read config for list object api, paginate through list objects.

def _list_paths(self, bucket, prefix):
        """ Read config for list object api, paginate through list objects."""
        s3 = self.s3
        kwargs = {"Bucket": bucket, "Prefix": prefix}
        if self.list_objects:
            list_objects_api = "list_objects"
        else:
            list_objects_api = "list_objects_v2"
        paginator = s3.get_paginator(list_objects_api)
        for page in paginator.paginate(**kwargs):
            contents = page.get("Contents", None)
            if not contents:
                continue
            for item in contents:
                yield item["Key"]