feat: Add ranged start & end className

Author: zombieJ

src/RangePicker.tsx

@@ -41,7 +41,7 @@ export interface RangePickerSharedProps<DateType> {
     | Exclude<RangeValue<DateType>, null>
     | (() => Exclude<RangeValue<DateType>, null>)
   >;
-  separator?: string;
+  separator?: React.ReactNode;
   allowEmpty?: [boolean, boolean];
   selectable?: [boolean, boolean];
   onChange?: (

src/panels/DatePanel/DateBody.tsx

@@ -109,6 +109,16 @@ function DateBody<DateType>({
               rangedValue && rangedValue[1],
               currentDate,
             ),
+            [`${datePrefixCls}-range-start`]: isSameDate(
+              generateConfig,
+              rangedValue && rangedValue[0],
+              currentDate,
+            ),
+            [`${datePrefixCls}-range-end`]: isSameDate(
+              generateConfig,
+              rangedValue && rangedValue[1],
+              currentDate,
+            ),
             [`${datePrefixCls}-today`]: isSameDate(
               generateConfig,
               today,