feat: Forward generics through associated types

[codecov[bot]]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (d508f65) 81.35% compared to head (1502d42) 81.47%.

Files	Patch %	Lines
sylvia-derive/src/strip_self_path.rs	72.72%	3 Missing :warning:
sylvia-derive/src/message.rs	93.75%	2 Missing :warning:
sylvia-derive/src/multitest.rs	83.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feat/generics_forwarding #293 +/- ## ============================================================ + Coverage 81.35% 81.47% +0.12% ============================================================ Files 28 28 Lines 1995 2008 +13 ============================================================ + Hits 1623 1636 +13 Misses 372 372 ```

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