Dockerless nitro-cli

[calincoman]

Issue #, if available:

Description of changes:

• image.rs: contains the ImageDetails struct, which represents the metadata of an image in OCI-compliant format.
• pull.rs: contains logic for pulling an image from a remote registry, as well as authentication.
• cache.rs: contains the implementation of the local filesystem cache, providing methods for storing and fetching images to/from cache.
• image_manager.rs: ImageManager struct, wrapper for the cache implementation.
• Refactored docker.rs to use the new code instead of the shiplift library.
• Updated Rust version in the tools/Dockerfiles to 1.59.0 in order to support a language feature used by a dependency.

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[calincoman]

You should take some time to make sure the CI passes on your PR.

Yes, I am looking on the tests now.

[raulmldv]

Split this PR in 5 smaller ones for easier review and merging.