add multihead attention

[ASEM000]

No description provided.

[codecov]

Codecov Report

Patch coverage: 97.36% and project coverage change: +0.17% 🎉

Comparison is base (99361fa) 90.61% compared to head (b93e91d) 90.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   90.61%   90.78%   +0.17%     
==========================================
  Files          40       42       +2     
  Lines        3718     3788      +70     
==========================================
+ Hits         3369     3439      +70     
  Misses        349      349              

Files Changed	Coverage Δ
serket/nn/dropout.py	94.23% <92.30%> (+1.44%)	⬆️
serket/nn/attention.py	97.72% <97.72%> (ø)
serket/nn/__init__.py	100.00% <100.00%> (ø)
tests/test_attention.py	100.00% <100.00%> (ø)

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