Patches based implementation for DRA snapshot.

Instead of exposing DeepCloning API - dynamicresources.Snapshot now exposes Fork/Commit/Revert methods mimicking operations in ClusterSnapshot. Now instead of storing full-scale copies of DRA snapshot we are only storing a single object with patches list stored inside, which allows very effective Clone/Fork/Revert operations while sacrificing some performance and memory allocation while doing fetch requests and inplace objects modifications (ResourceClaims).