Add check Redis connection

[mcmikius]

Need to add a connection check with Redis

The function should take the Redis connection options and return check the connection result.

Connection options example:
hostname: String, port: Int = RedisConnection.Configuration.defaultPort, password: String? = nil, tlsConfiguration: TLSConfiguration? = nil, database: Int? = nil, pool: [PoolOptions](https://api.vapor.codes/redis/documentation/redis/redisconfiguration/pooloptions) = .init()
or
serverAddresses: [SocketAddress], password: String? = nil, tlsConfiguration: TLSConfiguration? = nil, tlsHostname: String? = nil, database: Int? = nil, pool: [PoolOptions](https://api.vapor.codes/redis/documentation/redis/redisconfiguration/pooloptions) = .init()
or
url: URL, tlsConfiguration: TLSConfiguration? = nil, pool: [PoolOptions](https://api.vapor.codes/redis/documentation/redis/redisconfiguration/pooloptions) = .init()
or
url string: String, tlsConfiguration: TLSConfiguration? = nil, pool: [PoolOptions](https://api.vapor.codes/redis/documentation/redis/redisconfiguration/pooloptions) = .init()

Result example:
{ "componentId": "dfd6cf2b-1b6e-4412-a0b8-f6f7797a60d2", "componentType": "datastore", "observedValue": 75, "status": "warn", "time": "2018-01-17T03:36:48Z", "output": "", "links": { "self": "http://api.example.com/dbnode/dfd6cf2b/health" } }

Need divides cases for data store and pub-sub mode

Also need add unit tests