feat: update eslint-config-turbo to support ESLint Flat Config.

[anthonyshew]

Description

Adds ESLint Flat Config Support to eslint-config-turbo. Users will be able to use:

import turboConfig from "eslint-config-turbo/flat"

export default [
  ...turboConfig
]

This is meant to be backwards compatible with ESLint v8, leaving the extends key in place for that purpose.

Testing Instructions

Difficult to test this, so we'll be cutting a canary shortly after to make sure.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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[chris-olszewski]