feat: use extra="forbid" in annotation Validations

this can be problematic if many users have additional data in their annotations.

Author: xmatthias

freqtrade/strategy/interface.py

@@ -1871,7 +1871,9 @@ def ft_plot_annotations(self, pair: str, dataframe: DataFrame) -> list[Annotatio
                 if isinstance(annotation, dict):
                     # Convert to AnnotationType
                     try:
-                        AnnotationTypeTA.validate_python(annotation)
+                        # "forbid" extra fields to catch user errors
+                        # Can be questioned if this creates many problems
+                        AnnotationTypeTA.validate_python(annotation, extra="forbid")
                         annotations_new.append(annotation)
                     except ValidationError as e:
                         logger.error(f"Invalid annotation data: {annotation}. Error: {e}")