Action for running tests in parallel

[petrovic-d]

New action for running tests in parallel. It can be invoked via command: nbls.run.test.parallel
Command support specifying modules for which tests will be ran in parallel. It's up to client to pass the module list, so by default it will run without passed modules.
To test it with module list, it needs to be modified like this:
in java/java.lsp.server/vscode/src/extension.ts file
modify line 835 to:
testAdapter?.run(new vscode.TestRunRequest(), new vscode.CancellationTokenSource().token, true, ["module1", "module2"]);