CLI: Alias Commands for Better Usability

[wp99cp]

We should alias klein project list to klein list projects and klein mission list to klein list missions. This should improve the experience with the kleinkram CLI.

[wp99cp]

• research best practise for verb, object, ... in CLI commands
• decide for all core comands
• keep backward compatibility for both SDK and CLI, mark SDK methods as depricated.

[LevinCeglie]

will be closed with #2264