Fix GPU Compilation Errors and Upgrade NVML Wrapper

[shaik-noor]

This PR resolves compilation and linker errors in agent-core related to GPU monitoring, specifically addressing issues with nvml-wrapper version mismatches and missing MIG (Multi-Instance GPU) symbols.

Key Changes:

• Upgraded nvml-wrapper: Bumped version to 0.10 to better align with modern NVML features.
• Dynamic Loading for NVML Extensions: Switched from extern "C" static linking to dynamic loading (libloading) for extended NVML functions (PCIe stats, etc.) in
  nvml_ext.rs and gpu.rs
  . This prevents linker errors when symbols are missing from the system's NVML library.

MIG Collection Refactoring:

• Removed duplicated MIG collection logic in gpu.rs
• Corrected field access for BAR1MemoryInfo (renamed bar1Total/bar1Used to total/used).
• Added proper use scopes and fixed type mismatches.

Formatting & Linting:

• Applied strict cargo fmt fixes to gpu.rs (complex type indentation).
• Fixed clippy lints and snake_case naming conventions in nvml_ext.rs

Verification:

• Compilation: agent-core now compiles successfully with cargo build.
• CI: lint-and-test job passes.
• Unit Tests: Local tests for pcie_ext_stub_compiles pass.

Related Issues:

• Fixes linker errors on Windows/Linux environments where static NVML symbols were missing.
• Fixes build failures due to reduced BAR1 struct fields.