Add DuckDB support

[RasmusSkytte]

Intent

This PR adds support for DuckDB

Approach

• helper-setup.R was updated with the version from SCDB

• DBI::dbDisconnect() now gets the shutdown = TRUE argument required by DuckDB

Known issues

N/A

Checklist

• The PR passes all local unit tests
• I have documented any new features introduced
• If the PR adds a new feature, please add an entry in NEWS.md
• A reviewer is assigned to this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.87%. Comparing base (77ad8b1) to head (a7cdc72).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #127   +/-   ##
=======================================
  Coverage   92.87%   92.87%           
=======================================
  Files          16       16           
  Lines        1109     1109           
=======================================
  Hits         1030     1030           
  Misses         79       79           

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