feat: implement ignoring tests

[CommanderStorm]

This PR implements the following syntax:

test_each_path! { 
    #[cfg(feature = "integration")]
    for ["in", "out"] 
    in "./tests/integration" 
    as integration
    => test 
    ignore {
        "slow" => "Load tests, ignored for taking two hours",
        "external" => "Requires external services"
    }
}

Resolves #20

CC @nyurik

[CommanderStorm]

the only non-obvious change.
Without this, we are iterating in random order and there might be a case (which is why generate_name) exists that we need to reasign the testcase name.

This changes this to a deterministic sorting.

[JonathanBrouwer]

CI seems to be failing, could you run rustfmt?

[JonathanBrouwer]

This PR also makes the "the syntax of this macro is horrible" problem worse but I'm willing to accept that :)
I should get to implementing #13 sometime
Thanks for the nice PR

[CommanderStorm]

Shure, I also fixed a bug that I caused in my final cleanup before opening the PR ^^

The change can be seen to work here:

• test: Add shared dictionary synthetics maplibre/maplibre-tile-spec#854

[JonathanBrouwer]

I'll make a new release later today :)
Thanks!

[JonathanBrouwer]

Release has been made, was a day late but oops

[CommanderStorm]

you are amazing 🥇