Refactor FormBuilder export structure to include both default and named exports.

Author: agund

src/components/FormBuilder.ts

@@ -24,7 +24,7 @@ type SyncValidator = (value: string) => string;
 
 type AsyncValidator = (value: string) => Promise<string>;
 
-export default class FormBuilder {
+class FormBuilder {
   private fields: TemplateResult[] = [];
 
   private validateFunctions: Map<string, SyncValidator> = new Map();
@@ -221,4 +221,7 @@ export default class FormBuilder {
   getFields() {
     return this.fields;
   }
-}
+}
+
+export default FormBuilder;
+export { FormBuilder };