Implement GQA in AttentionConfiguration

[dorde-antic]

• Implements GQA in AttentionConfiguration class in perfRunner.
• attentionSweeps.py will be adjusted with changes from this PR in https://github.com/ROCm/rocMLIR-internal/issues/1800

Resolves https://github.com/ROCm/rocMLIR-internal/issues/1834

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1847      +/-   ##
===========================================
- Coverage    78.52%   78.18%   -0.34%     
===========================================
  Files          100      100              
  Lines        29907    30944    +1037     
  Branches      4452     4793     +341     
===========================================
+ Hits         23482    24192     +710     
- Misses        4590     4657      +67     
- Partials      1835     2095     +260     

Flag	Coverage Δ
mfma	78.17% <ø> (-0.35%)	⬇️
navi3x	78.18% <ø> (?)
navi4x	78.18% <ø> (?)

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see 43 files with indirect coverage changes

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