First cut at running build

I added a line to run the cmake.build command. It runs, but I'm not in
a position to test it at the moment. Also, I need to look up the
command and see if there are any command arguments that I should use.

issue #23

src/test_runner.ts

@@ -24,6 +24,8 @@ export async function run_tests(
  const { signal } = abort_controller;
  cancel_token?.onCancellationRequested(() => abort_controller.abort());
 
+ vscode.commands.executeCommand("cmake.build");
+
  const run = test_controller.createTestRun(run_request);
  const test_queue = get_test_list(run_request, test_controller);
  test_queue.forEach((test) => run.started(test));