Weight accessor

[tohtsky]

Implement a convenient accessor for factorization machines weights.

[codecov-commenter]

Codecov Report

Merging #11 (193eefb) into main (8ca5881) will increase coverage by 0.65%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
+ Coverage   92.00%   92.65%   +0.65%     
==========================================
  Files          17       17              
  Lines         750      803      +53     
==========================================
+ Hits          690      744      +54     
+ Misses         60       59       -1     

Impacted Files	Coverage Δ
src/myfm/gibbs.py	87.38% <100.00%> (+1.97%)	⬆️
src/myfm/variational.py	95.58% <100.00%> (+5.58%)	⬆️
src/myfm/base.py	91.11% <0.00%> (+0.55%)	⬆️

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