Change configuration item name and add it to json file

Change configuration item name from `spring.cloud.alicloud.acm.enable`
to `spring.cloud.alicloud.acm.enabled` and add this configuration item
to `additional-spring-configuration-metadata.json` file.

spring-cloud-alicloud-acm/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -4,6 +4,12 @@
       "name": "spring.application.group",
       "type": "java.lang.String",
       "description": "spring application group."
+    },
+    {
+      "name": "spring.cloud.alicloud.acm.enabled",
+      "type": "java.lang.Boolean",
+      "defaultValue": true,
+      "description": "enable acm or not."
     }
   ]
 }