feat: Support generic types in entry points

[jawoznia]

close #228

[codecov[bot]]

Codecov Report

Merging #249 (7c40662) into feat/generics_support (ea75996) will decrease coverage by 0.81%. The diff coverage is 12.90%.

@@                    Coverage Diff                    @@
##           feat/generics_support     #249      +/-   ##
=========================================================
- Coverage                  87.02%   86.21%   -0.81%     
=========================================================
  Files                         25       25              
  Lines                       1726     1741      +15     
=========================================================
- Hits                        1502     1501       -1     
- Misses                       224      240      +16     

Files	Coverage Δ
sylvia-derive/src/interfaces.rs	86.86% <100.00%> (ø)
sylvia-derive/src/lib.rs	100.00% <ø> (ø)
sylvia-derive/src/message.rs	84.82% <14.28%> (-0.25%)	:arrow_down:
sylvia-derive/src/parser.rs	76.36% <6.25%> (-5.28%)	:arrow_down:

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