Add custom request to return a list of all the tests in a project with locations #611
Description
This is something that would be used by the Visual Studio Code extension to provide location information for tests in the Test Explorer.
Currently the extension uses the swift test --list-tests command to get a list of tests, but this doesn't return locations of the tests. I did add a request swiftlang/swift-package-manager#5601 to add this information to the --list-tests output. But it seems it has been decided it would be easier to do this using SourceKit-LSP.