add exportRender method to be used in datatable-buttons for render print + exports as expected

Author: mrezagolestan

src/Html/Column.php

@@ -491,6 +491,20 @@ public function render(mixed $value): static
         return $this;
     }
 
+    /**
+     * Set Callback function to render column for Print + Export
+     *
+     * @param  function  $callback
+     * @return $this
+
+     */
+    public function exportRender(callable $callback): static
+    {
+        $this->attributes['exportRender'] = $callback;
+
+        return $this;
+    }
+
     /**
      * Parse render attribute.
      *