Allow the application to choose the order of commands within a command group

[lengau]

What needs to get done

Provide a command group configuration that keeps the order of the command names in the created group rather than alphabetising them.

Why it needs to get done

For most command groups, alphabetical by command name is completely sensible. However, some command groups, such as lifecycle commands, have a distinct order. In these cases, we should be able to retain the order.