Interface extension trait

[jawoznia]

closes #233

[codecov[bot]]

Codecov Report

Merging #236 (d7abd3b) into feat/generics_support (1efa876) will increase coverage by 0.25%. The diff coverage is 95.83%.

@@                    Coverage Diff                    @@
##           feat/generics_support     #236      +/-   ##
=========================================================
+ Coverage                  88.79%   89.05%   +0.25%     
=========================================================
  Files                         24       24              
  Lines                       1348     1380      +32     
=========================================================
+ Hits                        1197     1229      +32     
  Misses                       151      151              

Files	Coverage Δ
sylvia-derive/src/input.rs	94.68% <100.00%> (+0.05%)	:arrow_up:
sylvia-derive/src/utils.rs	69.69% <100.00%> (ø)
sylvia/src/types.rs	80.00% <ø> (ø)
sylvia-derive/src/message.rs	87.44% <95.65%> (+0.95%)	:arrow_up:

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