feat: Get registered ID for a given phone number (#483)

Exposes internal getNumberById function for easy usage.
This can help with dealing with brazilian numbers with the extra digit, always returning the correct ID.

This will probably eventually replace the current isRegisteredUser function.

Co-authored-by: Pedro Lopez <pedroslopez@me.com>

src/util/Injected.js

@@ -34,6 +34,7 @@ exports.ExposeStore = (moduleRaidStr) => {
 
 exports.LoadUtils = () => {
     window.WWebJS = {};
+
     window.WWebJS.getNumberId = async (id) => {
 
         let result = await window.Store.Wap.queryExist(id);
@@ -41,6 +42,7 @@ exports.LoadUtils = () => {
             throw 'The number provided is not a registered whatsapp user';
         return result.jid;
     };
+
     window.WWebJS.sendSeen = async (chatId) => {
         let chat = window.Store.Chat.get(chatId);
         if (chat !== undefined) {
@@ -50,6 +52,7 @@ exports.LoadUtils = () => {
         return false;
 
     };
+    
     window.WWebJS.sendMessage = async (chat, content, options = {}) => {
         let attOptions = {};
         if (options.attachment) {