Reuse types from cds-types

[daogrady]

Our type definitions used in the TSDoc are currently defined locally.
As @cap-js/cds-types is now a peer dependency, we could reuse all cds-related types from there. Especially the CSN flavours are good candidates for reuse.

[github-actions]

This issue has not been updated in a while. If it is still relevant, please comment on it to keep it open. The issue will be closed soon if it remains inactive.