fix: migrate enableBreakpointsFor in manifest (#428)

Author: dsclee1

package.json

@@ -112,15 +112,15 @@
     ]
   },
   "contributes": {
+    "breakpoints" : [
+      {
+        "language": "php"
+      }
+    ],
     "debuggers": [
       {
         "type": "php",
         "label": "PHP",
-        "enableBreakpointsFor": {
-          "languageIds": [
-            "php"
-          ]
-        },
         "program": "./out/phpDebug.js",
         "runtime": "node",
         "configurationAttributes": {