chore(linting): implement ESLint flat config for eslint-plugin-turbo

[jeremy-code]

Description

• Closes Docs: eslint v9 #7909
• Add "flat/recommended" config to eslint-plugin-turbo
• Add meta property to plugin (required for caching, see Adding Plugin Meta Information)
• Update eslint-plugin-turbo/README.md accordingly with information on using flat config

Testing Instructions

The rules or any actual functionality isn't changed, just the exports. The current tests all pass and I have tested the equivalent functionality on a separate project:

const eslint = require("@eslint/js");
const turbo = require("eslint-plugin-turbo");


module.exports = [
  eslint.configs.recommended,
  {
    plugins: { turbo },
    rules: {
      ...turbo.configs.recommended.rules,
    },
    settings: {
      ...turbo.configs.recommended.settings,
    },
  },
];

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[jeremy-code]

The new config is its own folder flat, which seems to be the current standard for maintaining backwards compatability (see eslint-plugin-vue).

I haven't updated eslint-config-turbo, because it is just a default export that extends the config.

I inlined the rules for now since the main export index.ts in eslint-plugin-turbo is where the rules are located, leading to a circular dependency. This may want to be changed in the future. Note that this will cause concerns with caching for those using the config since the metadata property is no longer there -- not certain whether to also inline that or ask whether the code should be rearranged.

Should have no issues in regards to backwards compatability.