Keyspace Notifications

[joshua-siw]

Hi, this is by no means finished—it's more about asking questions regarding the implementation:

I couldn't find a simple solution to access the publish functions from the storage session, so I publish them depending on the Garnet.Status from the RespServerSession.
However, this comes with some limitations. For example:

I need to detect these changes and send a notification, but I would need to somehow publish from the HashObject itself when DeleteExpiredItems() is called.

Does the approach still make sense, or do you think its entirely flawed and should be done differently? (regarding where to publish from, please mind the open todos missing tests etc.)

At the moment it can be tested on the following Commands:

DEL
HINCRBYFLOAT
HINCRBY
HPERSIST
INCRBYFLOAT
INCR, DECR, INCRBY, DECRBY
LINSERT
LSET
LTRIM
MSET
SETRANGE
SET
SMOVE

when activating the option via CONFIG SET notify-keyspace-events KEA
note: i only check for the exact string of "KEA" at the moment

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