feat(xml): add XML tools for validation, beautification, and viewing

src/pages/tools/xml/xml-validator/service.ts

@@ -0,0 +1,16 @@
+import { InitialValuesType } from './types';
+import { XMLValidator } from 'fast-xml-parser';
+
+export function validateXml(
+  input: string,
+  _options: InitialValuesType
+): string {
+  const result = XMLValidator.validate(input);
+  if (result === true) {
+    return 'Valid XML';
+  } else if (typeof result === 'object' && result.err) {
+    return `Invalid XML: ${result.err.msg} (line ${result.err.line}, col ${result.err.col})`;
+  } else {
+    return 'Invalid XML: Unknown error';
+  }
+}