Fix exception management when raising expression validation error: emit signal to quit thread to avoid crashing plugin

Fix update process: raise exception if expression could not be evaluated, check if ID for target feature was actually created, and do not check for duplicates on same ID

Update duplicate detection feature: make use of buffers intersection to detect more possible cases, and improve score based on surface ratio.

Update geometry duplicate detection: use buffer intersection for both detection (instead of inclusion) and area ratio (instead of bounding boxes)

Improve geometry duplicate detection: use buffer, orientation and surface coverage to compute duplicate score (0 to 1)

Fix ETL pipeline to use evaluated ID value in target layer to ensure unicity constraint is satisfied.

Implements updating target layer and applying transformation on selected features only if chosen. Fix save/load to JSON accordingly.

Check for existing features based on user defined ID field. If encountered, such features are not added to the target layer. Improvements expected.

Improve ETL process with duplicates check on geometry using Hausdorff distance. Update UI with checkbox for using geometry and a combobox to specify ID field in target layer.

Fix signals connection issue (duplicated at every run() call): signals should only be connected once, the first time the QDialog object is created.

Implement base functionalities: load source and target layers, read fields, allow transformation rules, apply ETL on field attributes only (geometry is not handled)