[kangaru 5] Figure out a better syntax for tag

[gracicot]

Is your feature request related to a problem? Please describe.
The tag syntax is quite unsatisfactory. It's quite hard to get right, hard to diagnose, and hard to discover. A better syntax needs to be drafted

Describe the solution you'd like
It should be easy to annotate a type and make it easy to tag types for most purposes

Describe alternatives you've considered

• Make injectable_reference_source forward some tags to avoid having to use multiple tags
• Add tag shortcuts that adds multiple tags, depending on specific user needs