Way to Go From Method Implementation to Interface Method Declaration

From https://github.com/Microsoft/vscode/issues/22385

TypeScript Version: 2.2.1

Code

interface ITest {
    test(): void;
}

class Test implements ITest {
    test() {
        return null;
    }
}

Request
Running go to definition on test in class Test currently does not return ITest::test. Neither does go to type definition.

In VSCode, we would like some way to jump from a class's interface method implementation or abstract method implementation to the interface method declaration or abstract method declaration itself. I'm not sure which command makes sense to do this, either go to definition or go to type definition, but we are open to any suggestions

Start by reproducing the provided TypeScript example and inspect the language-service handling for “go to definition” and “go to type definition.” The change is complete when navigation from the class method reaches the corresponding interface or abstract method declaration, with behavior covered by the relevant language-service tests.