Support init containers

[Stono]

Hello awesome project.
I've recently moved a bunch of stuff to Kubernetes Native Sidecars and depressingly lost the ability to use ksniff.

Looks like here;

ksniff/pkg/cmd/sniff.go

Lines 332 to 346 in b0b737c

	func (o *Ksniff) findContainerId(pod *corev1.Pod) error {
	for _, containerStatus := range pod.Status.ContainerStatuses {
	if o.settings.UserSpecifiedContainer == containerStatus.Name {
	result := strings.Split(containerStatus.ContainerID, "://")
	if len(result) != 2 {
	break
	}
	o.settings.DetectedContainerRuntime = result[0]
	o.settings.DetectedContainerId = result[1]
	return nil
	}
	}
	return errors.Errorf("couldn't find container: '%s' in pod: '%s'", o.settings.UserSpecifiedContainer, o.settings.UserSpecifiedPodName)
	}

is only considering ContainerStatuses, whereas native sidecars are under InitContainerStatuses

Would be awesome to support native sidecars.

alpha 1.28+
beta 1.29+