Major redo with respect to chats/contacts -- read desc

Waiting for chats & contacts is hella unreliable, so I've put them as events
1. receive chats via the `chats-received` event. If new chats are found, the flag for that is sent as well
2. receive contacts via the `contacts-received` event
3. When WA sends older messages, the `chats-update` or `chat-update` event is triggered
4. Baileys keeps track of all the changed conversations between connects

Connects almost always take less than 10 seconds!

src/Tests/Common.ts

@@ -7,7 +7,7 @@ export const testJid = process.env.TEST_JID || '1234@s.whatsapp.net' // set TEST
 
 export const makeConnection = () => {
     const conn = new WAConnection()
-    conn.connectOptions.maxIdleTimeMs = 45_000
+    conn.connectOptions.maxIdleTimeMs = 15_000
     conn.logger.level = 'debug'
 
     let evCounts = {}