✨ AsyncTask

with *AsyncTask* now you can perform asynchronous calls with less effort

src/components/async_task.cr

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+require "./*"
+
+class AsyncTask < JSCObject
+  enum States
+    Pending
+    Finished
+    Failed
+  end
+
+  @state = States::Pending
+  @param : JSC::JSValue = WebExtension.undefined.to_jsc
+  getter state
+  getter param
+
+  def initialize(callback : JSCFunction)
+    super()
+    self["callback"] = callback
+  end
+
+  def resolve(param)
+    @param = param.to_jsc
+    @state = States::Finished
+  end
+
+  def reject(param)
+    @param = param.to_jsc
+    @state = States::Failed
+  end
+
+  def callback : JSCFunction
+    self["callback"].as(JSCFunction)
+  end
+end