feat: add normal and bold to StacFontWeight (#261)

* feat: add `normal` and `bold` to `StacFontWeight`

* Fix: remove blank line in stac_text.dart

Author: Abdalqader27

packages/stac/lib/src/parsers/widgets/stac_font_weight/stac_font_weight.dart

@@ -9,7 +9,9 @@ enum StacFontWeight {
   w600,
   w700,
   w800,
-  w900;
+  w900,
+  normal,
+  bold;
 
   FontWeight get value {
     switch (this) {
@@ -39,6 +41,10 @@ enum StacFontWeight {
 
       case StacFontWeight.w900:
         return FontWeight.w900;
+      case StacFontWeight.normal:
+        return FontWeight.normal;
+      case StacFontWeight.bold:
+        return FontWeight.bold;
     }
   }
 }