Panic when calling `client.OptValue(kgo.WithLogger)` when logger was not set.

[sgtsquiggs]

Came across this while writing unit tests to assert I was configuring a client properly.

Wrong assumption made at pkg/kgo/client.go#L239-L243:

case namefn(WithLogger):
	if cfg.logger != nil {
		return []any{cfg.logger.(*wrappedLogger).inner}
	}
	return []any{nil}

The default logger is type *nopLogger pkg/kgo/config.go#L447