in-memory-database

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Now that we support more than 1 data type, we should include the values data type in cache nodes. This give us a way of easily identifying what type of data a key points to e.g. string, queue (and more types in the future)

Currently a cache node object consists of a Key, a Value and a TTL. We should also add a field specifying the type of the Value

This is already supported by upstream arrow crate, just need to invoke the relevant API.

We don't want to build releases on any tags, just for releases