Add `OAuthApi::userInfo()` for Storyblok OAuth user info

[roberto-butti]

Please implement first-class support for the official OAuth user info endpoint:

GET https://api.storyblok.com/oauth/user_info

Docs:
https://www.storyblok.com/docs/api/management/oauth/get-user-info

Context:

The client currently has UserApi::me(), which calls /v1/users/me. That endpoint does not work with OAuth access tokens used by Storyblok space plugins. For plugin OAuth flows, the documented endpoint is https://api.storyblok.com/oauth/user_info.

Requested implementation:

• Add Storyblok\ManagementApi\Endpoints\OAuthApi.
• Add method OAuthApi::userInfo().
• It should call GET /oauth/user_info against https://api.storyblok.com, not the default MAPI base URI.
• Use the existing ManagementApiClient authorization/header setup.
• Return a typed response/data object if consistent with existing package patterns.
• Add tests for successful response parsing and non-2xx handling.
• Do not change UserApi::me() behavior.

Goal:

Allow consumers using OAuth access tokens, especially Storyblok space plugins, to fetch the authenticated OAuth user info without manually bypassing the PHP client.

[RubenSanosh]

I'd like to work on this. I'll add an OAuthApi class with a userInfo() method
that calls GET https://api.storyblok.com/oauth/user_info and returns the parsed
response, following the same structure as the existing API classes (e.g. UserApi).
Will open a PR once it's ready.

[roberto-butti]

I'd like to work on this. I'll add an OAuthApi class with a userInfo() method that calls GET https://api.storyblok.com/oauth/user_info and returns the parsed response, following the same structure as the existing API classes (e.g. UserApi). Will open a PR once it's ready.

Hi @RubenSanosh thank you for this. Yes, if you want, you can work on this. If you have any questions, feel free. Or if you realize that you don't have time, no worries; let me know, I can work as well. As you prefer. Thank you