Add support for mat-vec product

[blegat]

On GPU

Before

After

BenchmarkTools.Trial: 10000 samples with 1 evaluation per sample.
 Range (min … max):  448.434 μs …  36.185 ms  ┊ GC (min … max): 0.00% … 0.00%
 Time  (median):     471.323 μs               ┊ GC (median):    0.00%
 Time  (mean ± σ):   485.125 μs ± 370.013 μs  ┊ GC (mean ± σ):  0.00% ± 0.00%

         ▂▅▇█▅▃▁                                                 
  ▁▁▁▂▃▄▆███████▇▅▄▃▃▂▃▂▂▂▂▂▂▂▂▃▂▃▃▃▃▂▂▂▂▂▁▁▂▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁ ▂
  448 μs           Histogram: frequency by time          566 μs <

 Memory estimate: 35.05 KiB, allocs estimate: 1140.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.45%. Comparing base (832140e) to head (22c30d5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
+ Coverage   90.29%   90.45%   +0.15%     
==========================================
  Files          23       23              
  Lines        2947     2974      +27     
==========================================
+ Hits         2661     2690      +29     
+ Misses        286      284       -2     

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