feat(SmartDataDbDoc): Add extended cursor method getCursorExtended for flexible cursor modifications

ts/classes.doc.ts

@@ -249,6 +249,19 @@ export class SmartDataDbDoc<T extends TImplements, TImplements, TManager extends
     return cursor;
   }
 
+  public static async getCursorExtended<T>(
+    this: plugins.tsclass.typeFest.Class<T>,
+    filterArg: plugins.tsclass.typeFest.PartialDeep<T>,
+    modifierFunction = (cursorArg: plugins.mongodb.FindCursor<plugins.mongodb.WithId<plugins.mongodb.BSON.Document>>) => cursorArg,
+  ) {
+    const collection: SmartdataCollection<T> = (this as any).collection;
+    let cursor: plugins.mongodb.FindCursor<any> = collection.mongoDbCollection.find(
+      convertFilterForMongoDb(filterArg),
+    );
+    cursor = modifierFunction(cursor);
+    return new SmartdataDbCursor<T>(cursor, this as any as typeof SmartDataDbDoc);
+  }
+
   /**
    * watch the collection
    * @param this