DeepSpeed on single GPU

[BobaZooba]

Description

• Add ability to run DeepSpeed on a single GPU
• DeepSpeed stage in Config now string

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've updated the code style using make codestyle.
• I've written tests for all new methods and classes that I created.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (97309e6) 79.6% compared to head (0108586) 80.0%.

Files	Patch %	Lines
src/xllm/core/config.py	61.1%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main      #8     +/-   ##
=======================================
+ Coverage   79.6%   80.0%   +0.4%     
=======================================
  Files         38      38             
  Lines       1329    1345     +16     
=======================================
+ Hits        1058    1076     +18     
+ Misses       271     269      -2     

Flag	Coverage Δ
unit	80.0% <69.6%> (+0.4%)	⬆️

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