Append Features to Layer 3.1.0 (QGIS 4.x)

What's Changed

• Allow adding new features including the PK value on update duplicate mode by @signedav in #42
• Follow-up: Set PG UUID PKs for non-duplicate features on UPDATE mode by @gacarrillor in #43

New Contributors

• @signedav made their first contribution in #42

Full Changelog: 3.0.0...3.1.0