fix: made the script asynchronous

Changes:

- made the script asynchronous in nature as suggested by Sergio to make
  it's performance more better
- applied suggestion from here: https://github.com/asyncapi/spec/pull/1046/files#r1535471235

scripts/validation/validate-examples.js

@@ -1,35 +1,43 @@
-const { execSync } = require('child_process');
+const { promisify } = require('util');
+const exec = promisify(require('child_process').exec);
 const glob = require('glob');
 
 // Use glob to find all YAML files in the examples directory
 const files = glob.sync('./examples/**/*.{yml,yaml}');
 
-let filesCount = 0;
+let filesCount = files.length;
 let errorFilesCount = 0;
 let filesWithErrors = []; // Array to store files that failed validation
-// Validate each file using AsyncAPI CLI
-files.forEach((file) => {
-  filesCount++;
+
+// Function to validate a single file asynchronously
+async function validateFile(file) {
   try {
     console.log(`\nValidating: ${file}`);
-    execSync(`npx asyncapi validate ${file}`, { stdio: 'inherit' });
+    await exec(`npx asyncapi validate ${file}`);
+    console.log(`Validation successful for: ${file}\n`);
   } catch (error) {
     console.error(`Validation failed for: ${file}\n`);
     errorFilesCount++;
     filesWithErrors.push(file);
   }
+}
 
-});
+// Run validation for all files asynchronously
+(async () => {
+  await Promise.all(files.map(validateFile));
 
-console.log(`\n\nValidation Completed!\nTotal files validated = ${filesCount}\nTotal files having error = ${errorFilesCount}`)
+  // Output validation result
+  console.log(`\n\nValidation Completed!\nTotal files validated = ${filesCount}\nTotal files having error = ${errorFilesCount}`);
 
-// Display files with errors
-if (filesWithErrors.length > 0) {
-  console.log('\nFiles with validation errors:');
-  filesWithErrors.forEach((file) => {
-    console.log(file);
-  });
-  process.exit(1);
-} else {
-  console.log('\nAll files validated successfully.');
-}
+  // Display files with errors
+  if (filesWithErrors.length > 0) {
+    console.log('\nFiles with validation errors:');
+    filesWithErrors.forEach((file) => {
+      console.log(file);
+    });
+    process.exit(1);
+  } else {
+    console.log('\nAll files validated successfully.');
+    process.exit(0);
+  }
+})();