feat: implement WhatsApp connection and message metrics

Added tracking for all WhatsApp-related metrics:

Connection metrics:
- active_connections: Gauge tracking active connections (inc on open, dec on close)
- connection_attempts_total: Counter for connection attempts (success/failure)

Message metrics:
- messages_sent_total: Counter with type label (text, image, video, audio, etc)
- messages_received_total: Counter with type label
- history_sync_messages_total: Counter for history sync messages

Added helper functions in prometheus-metrics.ts:
- incrementActiveConnections(), decrementActiveConnections(), setActiveConnections()
- recordConnectionAttempt(status)
- recordMessageSent(type), recordMessageReceived(type)
- recordMessageRetry(type), recordMessageFailure(type, reason)
- setMessagesQueued(count, priority)
- recordHistorySyncMessages(count)

src/Socket/messages-send.ts

@@ -56,6 +56,7 @@ import {
 	S_WHATSAPP_NET
 } from '../WABinary'
 import { USyncQuery, USyncUser } from '../WAUSync'
+import { recordMessageSent, recordMessageRetry, recordMessageFailure } from '../Utils/prometheus-metrics'
 import { makeNewsletterSocket } from './newsletter'
 
 export const makeMessagesSocket = (config: SocketConfig) => {
@@ -1038,6 +1039,17 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 			// Log with [BAILEYS] prefix
 			logMessageSent(msgId, destinationJid)
 
+			// Record message sent metric
+			const msgType = message.conversation ? 'text'
+				: message.imageMessage ? 'image'
+				: message.videoMessage ? 'video'
+				: message.audioMessage ? 'audio'
+				: message.documentMessage ? 'document'
+				: message.stickerMessage ? 'sticker'
+				: message.reactionMessage ? 'reaction'
+				: 'other'
+			recordMessageSent(msgType)
+
 			// Add message to retry cache if enabled
 			if (messageRetryManager && !participant) {
 				messageRetryManager.addRecentMessage(destinationJid, msgId, message)