Add IconIndicator

Similar functionality to a SquareIndicator but uses an icon instead of a
solid color.

src/types/unitframe.lua

@@ -26,6 +26,9 @@ local AuraList = types.AuraList
 ---@class SquareIndicator
 local SquareIndicator = types.SquareIndicator
 
+---@class IconIndicator
+local IconIndicator = types.IconIndicator
+
 ---@class SquareIndicator
 local BorderIndicator = types.BorderIndicator
 
@@ -148,12 +151,19 @@ function UnitFrame:CreateIndicator(indicator)
             indicator.fadeTime,
             indicator.flashTime
         )
-    elseif kind == "BorderIndicator" then
-        return BorderIndicator:new(
+    elseif kind == "IconIndicator" then
+        return IconIndicator:new(
             self,
-            indicator.thickness,
-            indicator.color
+            indicator.size,
+            indicator.point,
+            indicator.x,
+            indicator.y,
+            indicator.showStacks,
+            indicator.fadeTime,
+            indicator.flashTime
         )
+    elseif kind == "BorderIndicator" then
+        return BorderIndicator:new(self, indicator.thickness, indicator.color)
     else
         error(string.format("Invalid Indicator kind `%s` requested", indicator.kind))
     end