feat: add StringIcon * 2

Author: tenphi

.size-limit.js

@@ -26,13 +26,13 @@ module.exports = [
     path: './dist/es/index.js',
     webpack: true,
     import: '{ Button }',
-    limit: '33 kB',
+    limit: '34 kB',
   },
   {
     name: 'Tree shaking (just an Icon)',
     path: './dist/es/index.js',
     webpack: true,
     import: '{ AiIcon }',
-    limit: '22 kB',
+    limit: '23 kB',
   },
 ];