Add DRA ResourceClaim tracking for device allocation visualization

[yahavb]

Summary

• Watch ResourceClaim objects to track DRA (Dynamic Resource Allocation) device usage per node
• Enables visualization of devices managed by DRA drivers (e.g., AWS Neuron) that don't appear in traditional pod resource requests
• Maps the neuron.aws.com DRA driver to the aws.amazon.com/neuron allocatable resource so the progress bar shows correct utilization
• Gracefully degrades when the DRA API is not available on the cluster

Usage

# Neuron devices only
eks-node-viewer --resources aws.amazon.com/neuron

# CPU and Neuron devices together
eks-node-viewer --resources cpu,aws.amazon.com/neuron

# With node selector
eks-node-viewer --resources cpu,aws.amazon.com/neuron --node-selector node-type=trn2

# Alias for convenience
alias eks-node-viewer-neuron="eks-node-viewer --resources cpu,aws.amazon.com/neuron"

Example Output

Test plan

• Build succeeds with go build ./cmd/eks-node-viewer
• Existing tests pass with make test
• Neuron DRA allocation shows correct usage on trn2 nodes
• Gracefully handles clusters without DRA API enabled
• Works alongside traditional resource monitoring (cpu, memory)