Fix buckets not being duplicated correctly
Fix list id param not working
Add api endpoint
Add swagger docs
Add comment about test
Make duplicating actually work
Add copying link shares
Add copying list backgrounds
Add copying task relations
Add copying task comments
Add copying assignees
Add copying task task label relations
Add copying task attachments
Add duplicating tasks
Add basic struct and methods
Co-authored-by: kolaente <k@knt.li>
Reviewed-on: vikunja/api#603
