feat: Add store to manage Articles (#5048)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/store/modules/helpCenterArticles/getters.js

@@ -0,0 +1,23 @@
+export const getters = {
+  uiFlagsIn: state => helpCenterId => {
+    const uiFlags = state.articles.uiFlags.byId[helpCenterId];
+    if (uiFlags) return uiFlags;
+    return { isFetching: false, isUpdating: false, isDeleting: false };
+  },
+  isFetchingHelpCenterArticles: state => state.uiFlags.isFetching,
+  articleById: (...getterArguments) => articleId => {
+    const [state] = getterArguments;
+    const article = state.articles.byId[articleId];
+
+    if (!article) return undefined;
+
+    return article;
+  },
+  allArticles: (...getterArguments) => {
+    const [state, _getters] = getterArguments;
+    const articles = state.articles.allIds.map(id => {
+      return _getters.articleById(id);
+    });
+    return articles;
+  },
+};