[enhancement]: Store different keys in different in-memory stores

[Har-Kuun]

Which feature or improvement would you like to request?

I'd like to see this feature: It would be great to be possible to store different keys in different in-memory store.

Currently, only one in-memory store can be used. However, out of all the keys to be stored in the in-memory store, the two BAYES spam filter related keys need to be configured differently (e.g., in terms of persistence) than other keys. Therefore, it would be very handy if Stalwart supports the use of two in-memory stores at the same time, so that the two BAYES keys can be stored in a separate Redis instance or even another type of in-memory store.

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