Issue #2868014: [PP-1] Views Date Filter Datetime Granularity Option

Rel #2868014

core/modules/datetime/config/schema/datetime.views.schema.yml

@@ -21,6 +21,10 @@ views.argument.datetime_year_month:
 
 views.filter.datetime:
   type: views.filter.date
+  mapping:
+    granularity:
+      type: integer
+      label: 'Granularity'
 
 views.filter_value.datetime:
   type: views.filter_value.date