Add test for pod resources API- kep 3695

[Shilpa-Gokul]

Fixes #186

Adds an end-to-end test and accompanying demo that verifies the kubelet PodResources gRPC API correctly exposes DRA-allocated devices via the dynamicResources field introduced by KEP-3695.

Verification is done through a short-lived debug pod created on the same node as the workload. The debug pod uses two containers:

• curlimages/curl:latest (init container) — downloads api.proto from the Kubernetes v1.36.0 source into a shared EmptyDir volume. This is required because the kubelet gRPC server does not support server reflection.
• fullstorydev/grpcurl:latest (query container) — mounts the kubelet socket via a HostPath volume and calls v1.PodResourcesLister/List using the downloaded proto file via -import-path/-proto flags, running privileged as root to access the socket.

The response is captured from pod logs and asserted to contain the expected dynamicResources fields: pod name, container name, driver name, and claim name.

Assisted by: IBM Bob

[kubernetes-prow]

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