feat(next): add getAccessTokenRSC function to server actions

[alfonsograziano]

Summary

This PR improves the DX of the getAccessToken function, creating a new function that can be executed in the context of a React Server Component.

Testing

I'm not sure how to test this PR locally, I'd like to get support on this topic.

Checklist

• [x] .changeset
• [ ] unit tests
• [ ] integration tests
• [x] necessary TSDoc comments