fix: accept children in LivestreamPlayer components

[oliverlaz]

💡 Overview

Allows integrators to provide children components to our LivestreamPlayer components to allow easier extension and more convenient access to the underlying call instance.

e.g.:

<LivestreamPlayer callType="livestream" callId="123">
  <MyComponent />
</LivestreamPlayer>

const MyComponent = () => {
  // will have access to the `call` instance created by the player
  const call = useCall();
  // do stuff
};