GroupQueryAttention: concat query, key, and value inputs into packed qkv

[causten]

Target is 6.4.1 May require an additional changes to support accuracy

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.41%. Comparing base (695506a) to head (4a6c23d).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/rocm-rel-6.4    #3895   +/-   ##
=====================================================
  Coverage                 92.41%   92.41%           
=====================================================
  Files                       520      520           
  Lines                     22472    22476    +4     
=====================================================
+ Hits                      20767    20771    +4     
  Misses                     1705     1705           

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