Support for CLIENT SETINFO

[SoulPancake]

• Fixes Clients should identify themselves on connect #2654

[chayim]

@ofekshenawa thought you should take a look given what we'd discussed.

[ofekshenawa]

@SoulPancake LGTM!
Thank you for your contribution.

[monkey92t]

@SoulPancake

redis.doc: The CLIENT SETINFO command assigns various info attributes to the current connection which are displayed in the output of [CLIENT LIST](https://redis.io/commands/client-list) and [CLIENT INFO](https://redis.io/commands/client-info).

As described in the Redis documentation, it represents the state of a network connection rather than just a simple command.

[monkey92t]

We should invoke this method during connection initialization and ignore failures (for versions < 7.2) link: #2654 (comment)