Add runtime text shadow support

lib/runtime/models/runtime_node.dart

@@ -31,6 +31,10 @@ class RuntimeNode {
     this.color,
     this.fontSize,
     this.textAlign = RuntimeTextAlignValue.center,
+    this.textShadowColor,
+    this.textShadowOffsetX,
+    this.textShadowOffsetY,
+    this.textShadowBlur,
     this.radius,
     this.strokeWidth,
     this.value,
@@ -89,6 +93,10 @@ class RuntimeNode {
   final Color? color;
   final double? fontSize;
   final String textAlign;
+  final Color? textShadowColor;
+  final double? textShadowOffsetX;
+  final double? textShadowOffsetY;
+  final double? textShadowBlur;
   final double? radius;
   final double? strokeWidth;
   final double? value;
@@ -232,6 +240,18 @@ class RuntimeNode {
       color: _colorProp(props, RuntimeProtocolField.color) ?? color,
       fontSize: _doubleProp(props, RuntimeProtocolField.fontSize) ?? fontSize,
       textAlign: nextTextAlign,
+      textShadowColor:
+          _colorProp(props, RuntimeProtocolField.textShadowColor) ??
+          textShadowColor,
+      textShadowOffsetX:
+          _doubleProp(props, RuntimeProtocolField.textShadowOffsetX) ??
+          textShadowOffsetX,
+      textShadowOffsetY:
+          _doubleProp(props, RuntimeProtocolField.textShadowOffsetY) ??
+          textShadowOffsetY,
+      textShadowBlur:
+          _nonNegativeDoubleProp(props, RuntimeProtocolField.textShadowBlur) ??
+          textShadowBlur,
       radius: _doubleProp(props, RuntimeProtocolField.radius) ?? radius,
       strokeWidth:
           _doubleProp(props, RuntimeProtocolField.strokeWidth) ?? strokeWidth,
@@ -352,6 +372,19 @@ class RuntimeNode {
       color: _colorProp(map, RuntimeProtocolField.color),
       fontSize: _doubleProp(map, RuntimeProtocolField.fontSize),
       textAlign: textAlign,
+      textShadowColor: _colorProp(map, RuntimeProtocolField.textShadowColor),
+      textShadowOffsetX: _doubleProp(
+        map,
+        RuntimeProtocolField.textShadowOffsetX,
+      ),
+      textShadowOffsetY: _doubleProp(
+        map,
+        RuntimeProtocolField.textShadowOffsetY,
+      ),
+      textShadowBlur: _nonNegativeDoubleProp(
+        map,
+        RuntimeProtocolField.textShadowBlur,
+      ),
       radius: _doubleProp(map, RuntimeProtocolField.radius),
       strokeWidth: _doubleProp(map, RuntimeProtocolField.strokeWidth),
       value: _normalizedValueProp(map, RuntimeProtocolField.value),