Lukasz Piatkowski

Since git 2.29 negative refspecs [were introduced](https://github.blog/2020-10-19-git-2-29-released/#:~:text=Negative%20refspecs), but this library doesn't support them. I've noticed that while using jesseduffield's [lazygit](https://github.com/jesseduffield/lazygit) and provided a fix for them: https://github.com/jesseduffield/go-git/pull/1 Unfortunately that change...

Add Resolver type, use it as a return type for field and fix tests

16

## Description Change one of the overrides of `strawberry.field` to return `-> Resolver[T]` if `resolver = ...` is provided. This forces you to annotate your fields as `field: Resolver[int] =...

## Describe the Bug The code below doesn't give any warnings using `mypy` with Strawberry plugin or `PyRight`: ```python from strawberry import field, type def resolver() -> int: return 42...