AMDGPU support

[chengchingwen]

successor of #27

[codecov]

Codecov Report

Attention: Patch coverage is 53.57143% with 39 lines in your changes are missing coverage. Please review.

Project coverage is 73.73%. Comparing base (40922f8) to head (bc28f14).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...tentionlibAMDGPUExt/NeuralAttentionlibAMDGPUExt.jl	0.00%	14 Missing ⚠️
src/matmul/gemm.jl	78.94%	12 Missing ⚠️
...nlibGPUArraysExt/NeuralAttentionlibGPUArraysExt.jl	0.00%	9 Missing ⚠️
...alAttentionlibCUDAExt/NeuralAttentionlibCUDAExt.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   74.51%   73.73%   -0.78%     
==========================================
  Files          30       34       +4     
  Lines        2052     2052              
==========================================
- Hits         1529     1513      -16     
- Misses        523      539      +16     

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