* upgrade K8s dependency to v0.21
* update CRD for new version of controller-runtime
* fix ci component revision create must fill Raw in runtime.RawExtension
* try fix test
* start control plane timeout set to 1min and fix tests
* add timeout for env test start and stop
* longer timeout time for BeforeSuit function
* upgrade kubebuilder and k8s cluster version to match with v1.21.2 in github action
* fix test
* fix resource tracker ownerRef override
* update developer guides
1. add ConcurrentReconciles for setting the concurrent reconcile number of the controller
2. add DependCheckWait for setting the time to wait for ApplicationConfiguration's dependent-resource ready