feat(processor): export meta object for flat config

[TatsuyaYamamoto]

Related issue: nothing
Related PR: vuejs/vue-eslint-parser#190

This PR’s purpose is to support ESLint flat config.

Loading eslint-plugin-vue in flat config, ESLint check processor’s name and version in meta object.
https://github.com/eslint/eslint/blob/main/lib/config/flat-config-array.js#L220
https://github.com/eslint/eslint/blob/main/lib/config/flat-config-array.js#L45-L76

[TatsuyaYamamoto]

it looks like a lint error unrelated to this PR diff

https://app.circleci.com/pipelines/github/vuejs/eslint-plugin-vue/2007/workflows/2423c30e-c5b2-4353-ac13-fe741fb9f461/jobs/14466

> [email protected] lint /root/project
> eslint . --rulesdir eslint-internal-rules && markdownlint "**/*.md"


Oops! Something went wrong! :(

ESLint: 8.40.0

TypeError: Cannot read property 'getAllComments' of undefined
Occurred while linting /root/project/.eslintrc.js:1
Rule: "unicorn/expiring-todo-comments"
    at Object.Program

[TatsuyaYamamoto]

If installed ESLint v8.40, it seems to need to install eslint-plugin-unicorn v46.0.1 or higher.
sindresorhus/eslint-plugin-unicorn#2076

[TatsuyaYamamoto]

Added PR #2146

[FloEdelmann]

Thanks for the changes! I think we can merge them despite the failing tests.

[ota-meshi]

LGTM! Thank you!