chore: Add cache to improve widget performance (#11163)

- Add dynamic importing for routes.
- Added caching for `campaign`, `articles` and `inbox_members` API end
points.

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/widget/store/modules/articles.js

@@ -1,4 +1,7 @@
 import { getMostReadArticles } from 'widget/api/article';
+import { getFromCache, setCache } from 'shared/helpers/cache';
+
+const CACHE_KEY_PREFIX = 'chatwoot_most_read_articles_';
 
 const state = {
   records: [],
@@ -20,9 +23,16 @@ export const actions = {
     commit('setError', false);
 
     try {
+      const cachedData = getFromCache(`${CACHE_KEY_PREFIX}${slug}_${locale}`);
+      if (cachedData) {
+        commit('setArticles', cachedData);
+        return;
+      }
+
       const { data } = await getMostReadArticles(slug, locale);
       const { payload = [] } = data;
 
+      setCache(`${CACHE_KEY_PREFIX}${slug}_${locale}`, payload);
       if (payload.length) {
         commit('setArticles', payload);
       }