[Enhancement] Add CopyToClipboard action in code component (#329)

* Add CopyToClipboard action in websiteWidgetCode component

* Fix codeclimate issues

app/javascript/dashboard/helper/scriptGenerator.js

@@ -0,0 +1,42 @@
+export const createWebsiteWidgetScript = websiteToken => `
+<script>
+(function(d,t) {
+  var BASE_URL = '${window.location.origin}';
+  var g=d.createElement(t),s=d.getElementsByTagName(t)[0];
+  g.src= BASE_URL + "/packs/js/sdk.js";
+  s.parentNode.insertBefore(g,s);
+  g.onload=function(){
+    window.chatwootSDK.run({
+      websiteToken: '${websiteToken}',
+      baseUrl: BASE_URL
+    })
+  }
+})(document,"script");
+</script>
+`;
+
+export const createMessengerScript = pageId => `
+<script>
+  window.fbAsyncInit = function() {
+    FB.init({
+      appId: "${window.chatwootConfig.fbAppId}",
+      xfbml: true,
+      version: "v4.0"
+    });
+  };
+  (function(d, s, id){
+      var js, fjs = d.getElementsByTagName(s)[0];
+      if (d.getElementById(id)) { return; }
+      js = d.createElement(s); js.id = id;
+      js.src = "//connect.facebook.net/en_US/sdk.js";
+      fjs.parentNode.insertBefore(js, fjs);
+  }(document, 'script', 'facebook-jssdk'));
+
+</script>
+<div class="fb-messengermessageus"
+  messenger_app_id="${window.chatwootConfig.fbAppId}"
+  page_id="${pageId}"
+  color="blue"
+  size="standard" >
+</div>
+`;