TT#14098 Destroy and cleanup handle by a given id

Change-Id: I3ceb5db60a89dd3173262ecaad3665ba22978f7a

package.json

@@ -1,6 +1,6 @@
 {
   "name": "janus-videoroom-client",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "main": "src/janus.js",
   "scripts": {
     "test": "mocha -R spec --full-trace test/*-spec.js"

src/plugins/plugin.js

@@ -1,5 +1,7 @@
 'use strict';
 
+var Promise = require('bluebird');
+
 class Plugin {
 
     constructor(options) {
@@ -51,6 +53,28 @@ class Plugin {
             });
         });
     }
+
+    destroyHandle(handle) {
+        return this.destroyHandleById(handle.getId());
+    }
+
+    destroyHandleById(id) {
+        return new Promise((resolve, reject)=>{
+            if(this.hasHandle(id)) {
+                let handle = this.getHandle(id);
+                handle.detach().then(()=>{
+                    this.removeHandle(id);
+                    resolve();
+                }).catch((err)=>{
+                    this.removeHandle(id);
+                    reject(err);
+                });
+            } else {
+                this.removeHandle(id);
+                resolve();
+            }
+        });
+    }
 }
 
 module.exports.Plugin = Plugin;