Support to upload jar and run jar in RestClusterClient

The flink-kubernetes-operator is using the JarUpload + JarRun to support the session job submission. However, currently the RestClusterClient do not expose a way to upload the user jar to session cluster and trigger the jar run api. So a naked RestClient is used to achieve this, but it lacks the common retry logic.

Can we expose these two api the the rest cluster client to make it more convenient to use in the operator