chore: Update CsvCellStyle to match the new CellStyle

easyexcel-core/src/main/java/com/alibaba/excel/metadata/csv/CsvCellStyle.java

@@ -76,7 +76,7 @@ public class CsvCellStyle implements CellStyle {
     }
 
     @Override
-    public short getFontIndex() {
+    public int getFontIndex() {
         return 0;
     }
 
@@ -125,11 +125,6 @@ public class CsvCellStyle implements CellStyle {
         return null;
     }
 
-    @Override
-    public HorizontalAlignment getAlignmentEnum() {
-        return null;
-    }
-
     @Override
     public void setWrapText(boolean wrapped) {
 
@@ -150,11 +145,6 @@ public class CsvCellStyle implements CellStyle {
         return null;
     }
 
-    @Override
-    public VerticalAlignment getVerticalAlignmentEnum() {
-        return null;
-    }
-
     @Override
     public void setRotation(short rotation) {
 
@@ -185,10 +175,6 @@ public class CsvCellStyle implements CellStyle {
         return null;
     }
 
-    @Override
-    public BorderStyle getBorderLeftEnum() {
-        return null;
-    }
 
     @Override
     public void setBorderRight(BorderStyle border) {
@@ -200,11 +186,6 @@ public class CsvCellStyle implements CellStyle {
         return null;
     }
 
-    @Override
-    public BorderStyle getBorderRightEnum() {
-        return null;
-    }
-
     @Override
     public void setBorderTop(BorderStyle border) {
 
@@ -215,11 +196,6 @@ public class CsvCellStyle implements CellStyle {
         return null;
     }
 
-    @Override
-    public BorderStyle getBorderTopEnum() {
-        return null;
-    }
-
     @Override
     public void setBorderBottom(BorderStyle border) {
 
@@ -230,11 +206,6 @@ public class CsvCellStyle implements CellStyle {
         return null;
     }
 
-    @Override
-    public BorderStyle getBorderBottomEnum() {
-        return null;
-    }
-
     @Override
     public void setLeftBorderColor(short color) {
 
@@ -286,13 +257,11 @@ public class CsvCellStyle implements CellStyle {
     }
 
     @Override
-    public FillPatternType getFillPatternEnum() {
-        return null;
+    public void setFillBackgroundColor(short bg) {
     }
 
     @Override
-    public void setFillBackgroundColor(short bg) {
-
+    public void setFillBackgroundColor(Color color) {
     }
 
     @Override
@@ -310,6 +279,11 @@ public class CsvCellStyle implements CellStyle {
 
     }
 
+    @Override
+    public void setFillForegroundColor(Color color) {
+
+    }
+
     @Override
     public short getFillForegroundColor() {
         return 0;