feat: support dotnet 9+ extract interface code action

[alsi-lawr]

Resolves #266

[razzmatazz]

Nice! Though ideally I want to have tests added to ensure that something has actually been fixed here and prevent regressions.

[alsi-lawr]

Nice! Though ideally I want to have tests added to ensure that something has actually been fixed here and prevent regressions.

Absolutely, I'll add some tests. I was testing locally swapping out the mason-installed csharp-ls with my build to make sure it was now working. I noticed that there were 3 separate changes to the function call from .NET 8 -> .NET 9.0.100 -> .NET 9.0.300, where the Async function was dropped in the first change and the function arguments were changed in the second change, so I tried to cover all 3 and tested all 3 were working by setting the dotnet version. I'm not sure how I'd replicate that kind of test in a unit test though, but I'll give it a crack.

[alsi-lawr]

@razzmatazz I've added some tests (and parallelized the test execution), also moved the task helper to an extension function Task.fromResult

[razzmatazz]

There is a lot of whitespace/formatting changes in this PR which makes it a bit hard to read..
What tool did you use to reformat the files?
Ideally this would be done in a separate PR + a linter added to github actions to avoid churn later..

[alsi-lawr]

There is a lot of whitespace/formatting changes in this PR which makes it a bit hard to read.. What tool did you use to reformat the files? Ideally this would be done in a separate PR + a linter added to github actions to avoid churn later..

Yeah, really sorry for that, I didn't turn off my formatter (fantomas) and by the time I noticed it was too late. I can try to detangle it and create a new PR somehow

[razzmatazz]

There is a lot of whitespace/formatting changes in this PR which makes it a bit hard to read.. What tool did you use to reformat the files? Ideally this would be done in a separate PR + a linter added to github actions to avoid churn later..

Yeah, really sorry for that, I didn't turn off my formatter (fantomas) and by the time I noticed it was too late. I can try to detangle it and create a new PR somehow

Sorry for poking holes in your PR :(

I added a linter step in #271 w/ fantomas 7.0.3 (which has caused yet more reformatting).

[alsi-lawr]

@razzmatazz I believe the PR is in a good state to be reviewed now, no more formatting changes clogging up the diffs

[razzmatazz]

Thank you! This is an outstanding PR.

[razzmatazz]

This has been released as part of 0.20.0: https://www.nuget.org/packages/csharp-ls/0.20.0