fix(eslint): setup eslint to run on every package - N8N-4553 (#4050)

* fix(eslint): setup eslint to run on every package

Also, unify eslint config and dependencies into a private package in the workspace.

packages/@n8n_io/eslint-config/frontend.js

@@ -0,0 +1,39 @@
+/**
+ * @type {import('@types/eslint').ESLint.ConfigData}
+ */
+module.exports = {
+	plugins: ['vue'],
+
+	extends: [
+		'plugin:vue/essential',
+		'@vue/typescript',
+		'@n8n_io/eslint-config/base',
+	],
+
+	env: {
+		browser: true,
+		es6: true,
+		node: true,
+	},
+
+	parser: 'vue-eslint-parser',
+	parserOptions: {
+		parser: '@typescript-eslint/parser',
+	},
+
+	ignorePatterns: [
+		'**/*.js',
+		'**/*.d.ts',
+		'vite.config.ts',
+	],
+
+	rules: {
+		'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
+		'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
+		semi: [2, 'always'],
+		indent: ['error', 'tab'],
+		'comma-dangle': ['error', 'always-multiline'],
+		'no-tabs': 0,
+		'no-labels': 0,
+	},
+};