Feat/multi gpu support

[noleu]

Summary

This PR introduces comprehensive multi-GPU support to the OpenDC datacenter simulation platform, enabling simulation of modern GPU-accelerated workloads with arbitrary numbers of GPUs per node. The implementation extends the telemetry export system to capture detailed per-GPU metrics and refactors the GPU statistics reporting mechanism for improved performance analysis.

Implementation Notes ⚒️

• Dynamic GPU Export Columns: Extended the Parquet export functionality with a new withGpuColumns function in ComputeExportConfig that dynamically generates export columns based on the number of GPUs present, replacing hardcoded GPU column definitions
• Aggregated GPU Statistics: Refactored the GPU statistics reporting mechanism to provide a single, aggregated view instead of individual GPU statistics lists, simplifying downstream data processing and analysis
• Naming Convention Updates: Renamed MaxMinFairnessStrategy to MaxMinFairnessPolicy across factory and distributor components for better clarity and consistency
• Test Code Cleanup: Removed obsolete commented-out assertions in GPU tests to improve code maintainability
• Enhanced Telemetry Granularity: The new gpuColumns function generates detailed export columns based on GPU index, enabling comprehensive performance analysis of multi-GPU environments

External Dependencies 🍀

• N/A

Breaking API Changes ⚠️

• GPU Metrics Structure: The GPU metrics reporting API now returns aggregated data instead of individual GPU lists - downstream analysis code may need adjustments to handle the new data structure

[codecov]

Codecov Report

Attention: Patch coverage is 82.93651% with 43 lines in your changes missing coverage. Please review.

Project coverage is 62.62%. Comparing base (0203254) to head (df6829e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ava/org/opendc/simulator/compute/power/SimPsu.java	52.45%	21 Missing and 8 partials ⚠️
...opendc/simulator/engine/graph/FlowDistributor.java	79.41%	5 Missing and 2 partials ⚠️
...ndc/simulator/compute/workload/VirtualMachine.java	88.00%	2 Missing and 1 partial ⚠️
...mulator/telemetry/parquet/DfltTaskExportColumns.kt	84.61%	2 Missing ⚠️
...g/opendc/experiments/base/runner/ScenarioRunner.kt	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #351      +/-   ##
============================================
+ Coverage     62.54%   62.62%   +0.07%     
  Complexity       51       51              
============================================
  Files           354      354              
  Lines         12223    12256      +33     
  Branches       1250     1236      -14     
============================================
+ Hits           7645     7675      +30     
- Misses         4132     4146      +14     
+ Partials        446      435      -11     

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