[New feature] Auto reveal test file when open in editor

[nirgilboa]

It would be super helpful to have the Test Explorer side bar navigate (autoReveal in vscode slang) auto. to the test file currently open in the editor, allowing the user to see the various tests available in the file.

Currently if I edit a test file and switch to the Test Explorer, I have to manually search for it to see which tests are included in it. For large files with lots of tests this can be really useful and productive imho.

thx for an excellent extension btw 😄