feat: add redis driver identification

[vchomakov]

Summary

Adds getClientInfoTag helper function for Redis driver identification.

Changes

• Added getClientInfoTag() helper that returns a client info tag like nextjs-cache-handler_v2.5.1
• Added tests for the helper
• Updated example to use the new helper with both node-redis and ioredis

Why

This helps identify the library using the Redis client in CLIENT LIST output, useful for debugging and monitoring Redis connections.

Usage

import { getClientInfoTag } from '@fortedigital/nextjs-cache-handler/helpers/getClientInfoTag';

// node-redis
const client = createClient({
  url: 'redis://localhost:6379',
  clientInfoTag: getClientInfoTag(),
});

// ioredis
const client = new Redis(process.env.REDIS_URL, {
  clientInfoTag: getClientInfoTag(),
});

[AyronK]

Very good addition, thanks! I will test it and take further later this week.