[Refactor] Convert KafkaStore to EventStore

[lsampras]

Currently we have hardcoded KafkaStore as a composite of StorageInterface along with a kafka producer, However we wanna make this more generic by substituting KafkaProducer with a generic MessageInterface

The final structure of EventStore would look like

#[derive(Clone)]
pub struct EventStore<T: StorageInterface, E: MessagingInterface> {
    event_producer: E,
    storage: T,
}

This refactor could be done in 2 parts as follows

1. Use MessageInterface as a generic trait instead of fixed KafkaProducer
2. Remove KafkaMessage trait implementations and use MessageInterface instead

[rishav-bose0]

Hey @lsampras! I would like to help with this issue. Can I work on this?

[lsampras]

Hi @rishav-bose0, since this change is slightly spread out throughout the code base, I'd prefer if we connect on either slack or discord to formulate & plan the approach to solve this...

[rishav-bose0]

sure, I too had some doubts on the generic replacements. Let's connect on discord.

[speedhs]

Hey! Is this still open?

[lsampras]

Hey @speedhs thanks for the interest, unfortunately this issue is no longer relevant... Feel free to take a look at some of our other open issues