add snippets for debug configurations

Author: matthewbastien

package.json

@@ -1358,6 +1358,9 @@
       {
         "type": "swift",
         "label": "Swift Debugger",
+        "variables": {
+          "PickProcess": "lldb-dap.pickProcess"
+        },
         "configurationAttributes": {
           "launch": {
             "required": [
@@ -1490,6 +1493,7 @@
               },
               "pid": {
                 "type": [
+                  "string",
                   "number"
                 ],
                 "description": "System process ID to attach to."
@@ -1560,7 +1564,42 @@
               }
             }
           }
-        }
+        },
+        "configurationSnippets": [
+          {
+            "label": "Swift: Launch",
+            "description": "",
+            "body": {
+              "type": "swift",
+              "request": "launch",
+              "name": "${2:Launch Swift Executable}",
+              "program": "^\"\\${workspaceRoot}/.build/debug/${1:<program>}\"",
+              "args": [],
+              "env": {},
+              "cwd": "^\"\\${workspaceRoot}\""
+            }
+          },
+          {
+            "label": "Swift: Attach to Process",
+            "description": "",
+            "body": {
+              "type": "swift",
+              "request": "attach",
+              "name": "${2:Attach to Swift Executable}",
+              "pid": "^\"\\${command:PickProcess}\""
+            }
+          },
+          {
+            "label": "Swift: Attach",
+            "description": "",
+            "body": {
+              "type": "swift",
+              "request": "attach",
+              "name": "${2:Attach to Swift Executable}",
+              "program": "^\"\\${workspaceRoot}/.build/debug/${1:<program>}\""
+            }
+          }
+        ]
       }
     ]
   },