ioredis: Add some missing properties (#10240)
ioredis: Add some missing properties (#10240)

These are minor changes:

* There's a `status` field that can be used to check if the connection to the redis server is active.
* There's a `getBuffer` method that returns a node `Buffer` instance instead of a string (if you're saving binary data on redis, this is useful).
* The callback on `connect` is optional.
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