feat: support RETURNING clause

[ginnwork]

Resolves #138

[pi0]

Can you please add a test? 🙏🏼

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@2e62a68). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage        ?   46.22%           
=======================================
  Files           ?       19           
  Lines           ?      675           
  Branches        ?       67           
=======================================
  Hits            ?      312           
  Misses          ?      358           
  Partials        ?        5           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[nick-w-nick]

@ginnwork the RETURNING clause is specific to Postgres, can you make this non-generic so it only applies to the applicable dialect(s) and can be overridden as needed?

[ginnwork]

I updated the pull request with the changes @nick-w-nick suggested and added the tests @pi0 requested.

Was there any other changes needed to merge this pull request?