[6.x] Add redis.connection aliases in container

[paulhenri-l]

In order to add on these improvements:

• [5.6] Redis Connection Contract #24142
• [5.4] Add a container alias for the redis connection instance. #17722

I've added two aliases to the redis.connection binding.

These aliases are:

• \Illuminate\Redis\Connections\Connection::class
• \Illuminate\Contracts\Redis\Connection::class

It will then allow anyone to type hint on the redis Connection class or Contract and let the container resolve the correct connection implementation.

This behavior will also be consistent with the database one.

One other advantage of doing this is that developers won't need to type hint on the lower level RedisManager class. This will result in code that is less coupled to the framework internals.