test: fix duplicated test runs from test_case and stuck::test

[kezhuw]

Closes #51.

[kezhuw]

This bases on the general solutions I posted in frondeus/test-case#143. But after rethinking the whole things from ground. I think following rule should work even better.

Don't generate any form of #[test], let user to do it instead.

#[test_case("noop")]
#[tokio::test]
#[test_log::test]
#[test]
async fn test_method(name: &str) {
    // ...
}

This way the above code should work intuitively. Test proc macros should only transform or decorate test method.

Sadly, it is apparently a breaking change. Even worse, doing this in major version probably will lose tests silently. Other approaches are probably not general enough(d-e-s-o/test-log@5281a23) or need cooperation among macros(frondeus/test-case#143).

Let the compiler to merge/deduplicate #[test] is also an approach. Seems that test is a compiler builtin macro. Not sure it is worth, as I think it is a mistake to generate #[test] as it is not composable and cooperative.

[kezhuw]

Given frondeus/test-case#143 (comment), I think it is ok for #[stuck::test] to append #[::core::prelude::v1::test] in case of it does not exist.