tests: add a test for property binding case insensitivity

Author: adrienbaron

processors/src/test/resources/propertybinding/PropertyBindingComponent.html

@@ -2,4 +2,5 @@
   <input type="text" :required="true"/>
   <div :id='"MyID"'></div>
   <input :max-length='10' :non-existing-property="15"/>
+  <TEXTArea :AUtoFOCUS="false"/>
 </div>

processors/src/test/resources/propertybinding/compileresult/PropertyBindingComponentExposedType.java

@@ -38,4 +38,11 @@ public class PropertyBindingComponentExposedType extends PropertyBindingComponen
     // PropertyBindingComponent.html, line 4
     return Js.asAny(15);
   }
+
+  @JsMethod
+  @SuppressWarnings("unusable-by-js")
+  public boolean exp$4() {
+    // PropertyBindingComponent.html, line 5
+    return (boolean) (false);
+  }
 }