crane: Enhancements suggest in crane push

[Mukuls77]

Crane push can be enhanced with following functionality

1. Support for upload of compressed tar files: currently crane push only expect the input file in .tar format but if we compare a similar functionality on docker it support upload of tar files in compressed format also tar.gz, gzip, bzip2, xz or zstd. So crane can be enhanced to support upload of compressed tar files.
2. Support to fetch the Registry Tag from tar file manifest.json: Currently while uploading a tar file we need to explicitly provide the tag to be applied on the image in registry. I think this should be made optional and in case user does not provide the tag in the crane push command than crane can extract the repo tag from manifest.json file of the image tarball and use it to apply on the image getting uploaded.

These enhancements will help make crane tool more usable for end users.