Migrate to eslint flat configuration file

Signed-off-by: jsetton <[email protected]>

lambda/.npmignore

@@ -0,0 +1,4 @@
+.npmignore
+eslint.config.js
+coverage/
+test/

lambda/eslint.config.js

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+/**
+ * Copyright (c) 2010-2024 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+
+import js from '@eslint/js';
+import pluginMocha from 'eslint-plugin-mocha';
+import pluginNode from 'eslint-plugin-n';
+import pluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+
+export default [
+  js.configs.recommended,
+  pluginMocha.configs.flat.recommended,
+  pluginNode.configs['flat/recommended-script'],
+  pluginPrettierRecommended,
+  {
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'module'
+    },
+    rules: {
+      'no-console': 'warn'
+    }
+  }
+];