bolshakov / stoplight / 14464967390

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Add support for Redis connection pooling (#298)

Adds support for using connection pools with the Redis data store. This allows Stoplight
to efficiently manage Redis connections in multi-threaded environments, preventing
connection exhaustion in high-traffic applications.

* Added connection_pool gem to development dependencies
* Modified the Redis data store to accept either a direct Redis client or a ConnectionPool instance
* Used `.then` method to safely access the Redis client from either source
* Updated specs to test both direct Redis client and ConnectionPool scenarios
* Added documentation for connection pooling usage

The `Stoplight::DataStore::Redis` class now accepts either a `Redis` client or a `ConnectionPool` of
Redis clients in its constructor. It then uses the `.then` method to handle both cases uniformly:

```ruby
@redis.hset(states_key, config.name, state)

@redis.then { _1.hset(states_key, config.name, state) }
```

This change is backward compatible and should not affect existing code. Users who want to take advantage of connection pooling will need to add the +connection_pool+ gem to their dependencies and update their configuration as shown in the documentation.

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