This change adds the `--features` and `--all-features` flags to the
above mentioned commands. This is to allow publishing of crates that
have certain feature requirements for compilation, without having to
rely on `--no-verify` which isn't good practise.

This PR adds two new fields `features` and `all_features` to both the
`PackageOpts` and `PublishOpts` and also adds the argument options
to the CLI commands.

Merging this feature will allow people to publish crates on crates.io
that require some feature flag to compile (or all?) without needing
to rely on not checking the package before uploading, potentially
resulting in less packaging errors and broken packages.