feat: Forward generics to the interface

[jawoznia]

Part of #263

[codecov[bot]]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (ef1da32) 86.56% compared to head (b84a48f) 87.25%.

Files	Patch %	Lines
sylvia-derive/src/multitest.rs	94.59%	4 Missing :warning:
sylvia-derive/src/interfaces.rs	50.00%	3 Missing :warning:
sylvia-derive/src/parser.rs	85.71%	3 Missing :warning:
sylvia-derive/src/input.rs	96.77%	1 Missing :warning:
sylvia-derive/src/message.rs	97.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feat/generics_forwarding #264 +/- ## ============================================================ + Coverage 86.56% 87.25% +0.68% ============================================================ Files 25 25 Lines 1742 1812 +70 ============================================================ + Hits 1508 1581 +73 + Misses 234 231 -3 ```

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