feat: add KeywordDigitCounter class for filtering digit counters in OCR results

module/ocr/keyword.py

@@ -201,3 +201,18 @@ class Keyword:
 
         # Not found
         raise ScriptError(f'Cannot find a {cls.__name__} instance that matches "{name}"')
+
+
+class KeywordDigitCounter(Keyword):
+    """
+    A fake Keyword class to filter digit counters in ocr results
+    OcrResultButton.match_keyword will be a str
+    """
+
+    @classmethod
+    def find(cls, name, lang: str = None, ignore_punctuation=True):
+        from module.ocr.ocr import DigitCounter
+        if DigitCounter.is_format_matched(name):
+            return name
+        else:
+            raise ScriptError