RED-8670: add table detection from idp result

* some 'slight' refactoring

layoutparser-service/layoutparser-service-processor/src/main/java/com/knecon/fforesight/service/layoutparser/processor/services/tables/TableGridStructureCalculator.java

@@ -114,6 +114,8 @@ public class TableGridStructureCalculator {
         }
         List<List<Cell>> rows = buildRows(cells);
         if (isNotRectangular(rows)) {
+            // For some tables the result is not rectangular, this either happens if cells are missing or the algorithm would need more than the max iterations to solve it.
+            // This is unacceptable so we revert to the area sweep implementation, which by design will always produce a rectangular result.
             return areaSweepFallback();
         }
         rows = removeEmptyRows(rows);