Update eslint configs to 9.x plain

Author: tshemsedinov

eslint.config.js

@@ -0,0 +1,5 @@
+'use strict';
+
+const init = require('eslint-config-metarhia');
+
+module.exports = init;

prettier.config.js

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = {
+  printWidth: 80,
+  singleQuote: true,
+  trailingComma: 'all',
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+};