Redis and RedisCache clients

[vladimirmyshkovski]

• Add redis-client.js module
• Replace client to imported redis-client in ioEmitter.js
• Create cache module with RedisCacheClient .
• Replace redis to ioredis in dependencies.

Now we can use it like that:

const redisCacheClient = require('cache');
const cache = redisCacheClient.child('products');
const name = `key`;
await cache.exists(name);
await cache.get(name);
await cache.set(name, html);
await cache.remove(name);
await cache.removeAll();

[vladimirmyshkovski]

Guys, interesting your opinion about this improvement.