rollandf / nvidia-k8s-ipam / 20091146080

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feat: implement perNodeExclusions logic for IPPool and CIDRPool

Add logic to convert index-based perNodeExclusions to IP-based exclusions
in the ipam-node controllers. Each node converts its allocated IP range
exclusions independently and merges them with pool-wide exclusions.

Changes:
- Add buildPerNodeExclusions() to IPPool controller
  - Converts index-based exclusions to IP addresses for node's IP block
  - Merges with pool-wide exclusions before passing to allocator
- Add buildPerNodeExclusions() to CIDRPool controller
  - Converts index-based exclusions to IP addresses for node's prefix
  - Combines with filtered pool-wide exclusions
- Add unit tests

Implementation details:
- Each node processes only its own allocation (per-node)
- Index-based ranges are converted to IP-based ExclusionRange objects
- Ranges are clamped to node's allocation boundaries
- Ranges outside node's allocation are skipped
- Reuses existing allocator exclusion mechanism (no allocator changes)

Example:
  perNodeExclusions:
    - startIndex: 0
      endIndex: 10

Node-A (192.168.0.1-192.168.0.100) excludes 192.168.0.1-192.168.0.11
Node-B (192.168.0.101-192.168.0.200) excludes 192.168.0.101-192.168.0.111

Signed-off-by: Fred Rolland <frolland@nvidia.com>

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