Add Generic Package Repository access
<!--- Please read this! Before opening a new issue, make sure to search for keywords in the issues filtered by the "feature" label: - https://gitlab.com/gitlab-org/cli/-/issues/?label_name%5B%5D=type%3A%3Afeature and verify the issue you're about to submit isn't a duplicate. ---> ### Problem to solve I would love to speak to the [package registry](https://docs.gitlab.com/ee/user/packages/generic_packages/) via glab. Especially uploading generic packages is tedious, because I have to lookup my token all the time and use curl. <!-- What problem do we solve? Try to define the who/what/why of the opportunity as a user story. For example, "As a (who), I want (what), so I can (why/value)." --> ### Proposal Add another command to upload/download packages
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