When a pod is force-deleted UnprepareResources fails to get a claim
from an API server.
PrepareResources should cache claim info required by the
UnprepareResources so that UnprepareResources would get it from
the cache instead of querying API server.
The checkpointing mechanism will repopulate DRA Manager in-memory cache on kubelet restart.
This will ensure that the information needed by the PodResources API is available across
a kubelet restart.
The ClaimInfoState struct represent the DRA Manager in-memory cache state in checkpoint.
It is embedd in the ClaimInfo which also include the annotation field. The separation between
the in-memory cache and the cache state in the checkpoint is so we won't be tied to the in-memory
cache struct which may change in the future. In the ClaimInfoState we save the minimal required fields
to restore the in-memory cache.
Signed-off-by: Moshe Levi <moshele@nvidia.com>
