A Reconciler to avoid crossplane keep polling the resource by adding the annotation crossplane.io/paused.

It will pause the resource if and only if:

1. The resource is Ready and Sync.
2. The time since last time we pause it is not longer than FrozenTimeDuration.
3. The resource is not deleted.

It will unpause the resource if one of the flowing condition is met:

1. The resource deleted.
2. The resource is paused longer than UnPausePollInterval.
3. The spec is updated.

See example.go about how to use it.