feat: Emit error if contract macro is above entry_points

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 85.01%. Comparing base (d1052d5) to head (e2c4bfa).

Files	Patch %	Lines
sylvia-derive/src/input.rs	0.00%	15 Missing :warning:
sylvia-derive/src/lib.rs	0.00%	2 Missing :warning:
sylvia-derive/src/message.rs	0.00%	1 Missing :warning:
sylvia-derive/src/parser/entry_point.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #408 +/- ## ========================================== - Coverage 85.33% 85.01% -0.33% ========================================== Files 42 42 Lines 2905 2916 +11 ========================================== Hits 2479 2479 - Misses 426 437 +11 ```

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[jawoznia]

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