publish --all to detect required order to publish

[jayvdb]

publish --all fails for https://github.com/Electron100/butane because the order in https://github.com/Electron100/butane/blob/master/Cargo.toml is not the order required to publish. For that project, butane_core has the no dependencies on the other workspace members, while all the others have dependencies on butane_core. So butane_core should be published first, then butane_codegen, etc, etc.

This required order can be determined automatically, and IMO the nature of publish should mean the --all/--workspace flags use this altered ordering , departing slightly for the docs which say

Workspace members will be performed according to the order of the 'packages' fields of cargo metadata.

[taiki-e]

I would accept a PR to treat the "publish" subcommand as a special case of --all/--workspace.