Add user info to review endpoint return

[JoseRenan]

Is your feature request related to a problem? Please describe.
We need to show on the track page not only the track reviews but also the context about who reviewed, so the route GET /tracks/:id/reviews should return instead of the authorUid only, return an object like:

author: {
    displayName: string,
    avatarUrl: string,
    authorUid: string
}

This object don't need to be on the database, but recovered always the endpoint is called, to keep a single source of truth (it would be worse if we keep this data on the reviews entry and the user update that info...)

[JoseRenan]

If you get this task, it's good to update the front where this endpoint is being used, since it's a change on the return, maybe something will break