Don't block waiting for debug configurations (#1914)

When a folder is added to the workspace context we were awaiting the
`makeDebugConfigurations` method. This method generates launch
configurations in the launch.json. If the method finds it needs to
update existing launch configurations, it puts of a warning message
dialog prompting the user for action.

Because we were awaiting this method, the dialog blocks folder addition
and in turn prevents sourcekit-lsp and other extension features from
activating for the folder until the dialog is dismissed.

Because nothing relies on the result of `makeDebugConfigurations`,
simply kick off the work but don't await it.

Issue: #1912

Author: plemarquand

src/extension.ts

@@ -217,17 +217,19 @@ function handleFolderEvent(logger: SwiftLogger): (event: FolderEvent) => Promise
 
         switch (operation) {
             case FolderOperation.add:
-                // Create launch.json files based on package description.
-                await debug.makeDebugConfigurations(folder);
+                // Create launch.json files based on package description, don't block execution.
+                void debug.makeDebugConfigurations(folder);
+
                 if (await folder.swiftPackage.foundPackage) {
                     // do not await for this, let packages resolve in parallel
                     void folderAdded(folder, workspace);
                 }
                 break;
 
             case FolderOperation.packageUpdated:
-                // Create launch.json files based on package description.
-                await debug.makeDebugConfigurations(folder);
+                // Create launch.json files based on package description, don't block execution.
+                void debug.makeDebugConfigurations(folder);
+
                 if (
                     (await folder.swiftPackage.foundPackage) &&
                     !configuration.folder(folder.workspaceFolder).disableAutoResolve