update line layer

lib/src/style/layer/line_layer.dart

@@ -17,6 +17,7 @@ class LineLayer extends Layer {
     this.lineSortKey,
     this.lineBlur,
     this.lineColor,
+    this.lineColors,
     this.lineDasharray,
     this.lineGapWidth,
     this.lineGradient,
@@ -60,6 +61,9 @@ class LineLayer extends Layer {
   /// The color with which the line will be drawn.
   int? lineColor;
 
+  /// The colors interpolated
+  List<dynamic>? lineColors;
+
   /// Specifies the lengths of the alternating dashes and gaps that form the dash pattern. The lengths are later scaled by the line width. To convert a dash length to pixels, multiply the length by the current line width. Note that GeoJSON sources with `lineMetrics: true` specified won't render dashed lines to the expected scale. Also note that zoom-dependent expressions will be evaluated only at integer zoom levels.
   List<double?>? lineDasharray;
 
@@ -121,6 +125,9 @@ class LineLayer extends Layer {
     if (lineColor != null) {
       paint["line-color"] = lineColor?.toRGBA();
     }
+    if (lineColors != null) {
+      paint["line-color"] = lineColors;
+    }
     if (lineDasharray != null) {
       paint["line-dasharray"] = lineDasharray;
     }
@@ -207,6 +214,7 @@ class LineLayer extends Layer {
       lineSortKey: map["layout"]["line-sort-key"] is num? ? (map["layout"]["line-sort-key"] as num?)?.toDouble() : null,
       lineBlur: map["paint"]["line-blur"] is num? ? (map["paint"]["line-blur"] as num?)?.toDouble() : null,
       lineColor: (map["paint"]["line-color"] as List?)?.toRGBAInt(),
+      lineColors: (map["paint"]["line-color"] as List?),
       lineDasharray: (map["paint"]["line-dasharray"] as List?)?.map<double?>((e) => e.toDouble()).toList(),
       lineGapWidth:
           map["paint"]["line-gap-width"] is num? ? (map["paint"]["line-gap-width"] as num?)?.toDouble() : null,