Flat config support & improvements for d.ts

[what1s1ove]

Hey guys! First of all, thank you for such a cool plugin!

Since ESLint 9 is soon to be released, are there any plans to add a Flat config and, equally importantly, improve the d.ts files of the plugin?

eslint.config.js:25:3 - error TS2322: Type 'typeof import("node_modules/eslint-plugin-wc/lib/index")' is not assignable to type 'Plugin'.
  Types of property 'configs' are incompatible.
    Type '{ recommended: { plugins: string[]; parserOptions: { sourceType: string; }; rules: { 'wc/no-constructor-attributes': string; 'wc/no-invalid-element-name': string; 'wc/no-self-class': string; }; }; 'best-practice': { ...; }; }' is not assignable to type 'Record<string, FlatConfig | ConfigData<RulesRecord> | FlatConfig[]>'.
      Property 'recommended' is incompatible with index signature.
        Type '{ plugins: string[]; parserOptions: { sourceType: string; }; rules: { 'wc/no-constructor-attributes': string; 'wc/no-invalid-element-name': string; 'wc/no-self-class': string; }; }' is not assignable to type 'FlatConfig | ConfigData<RulesRecord> | FlatConfig[]'.
          Type '{ plugins: string[]; parserOptions: { sourceType: string; }; rules: { 'wc/no-constructor-attributes': string; 'wc/no-invalid-element-name': string; 'wc/no-self-class': string; }; }' is not assignable to type 'ConfigData<RulesRecord>'.
            The types of 'parserOptions.sourceType' are incompatible between these types.
              Type 'string' is not assignable to type '"script" | "module" | undefined'.

25   wc,
     ~~

eslint.config.js:27:2 - error TS2322: Type '{ 'wc/guard-super-call': ["off"]; 'wc/attach-shadow-constructor': string; 'wc/no-child-traversal-in-attributechangedcallback': string; 'wc/no-child-traversal-in-connectedcallback': string; ... 5 more ...; 'wc/require-listener-teardown': string; }' is not assignable to type 'RulesRecord'.
  Property ''wc/attach-shadow-constructor'' is incompatible with index signature.
    Type 'string' is not assignable to type 'RuleEntry<any[]>'.

27  rules: {
    ~~~~~

  ../../node_modules/@types/eslint/index.d.ts:1116:9
    1116         rules?: RulesRecord;
                 ~~~~~
    The expected type comes from property 'rules' which is declared here on type 'FlatConfig'

[RoXuS]

+1