Rename `Actor` interface so that it doesn't clash with the SDK

[janbuchar]

See https://github.com/apify/apify-client-js/blob/master/src/resource_clients/actor.ts#L224 - the interface Actor returned from ActorClient.get could benefit from being renamed to e.g. ActorResponse or ActorData.

Stems from feedback by @Jkuzz - https://apify.slack.com/archives/CD0SF6KD4/p1740146722916739

[B4nan]

potentially breaking, lets wait for major bump