feat: add message retry and failure metrics tracking

Added metrics tracking for:
- message_retries_total: Incremented when message retry is attempted
- message_failures_total: Incremented when max retries reached or encryption fails

Note: messages_queued metric is not applicable as this implementation
sends messages directly without an explicit queue system.

src/Socket/messages-send.ts

@@ -596,6 +596,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 		const nodes = (await Promise.all(encryptionPromises)).filter(node => node !== null) as BinaryNode[]
 
 		if (recipientJids.length > 0 && nodes.length === 0) {
+			recordMessageFailure('send', 'encryption_failed')
 			throw new Boom('All encryptions failed', { statusCode: 500 })
 		}