[ENH] Store used entities to be used later on

[Aran30]

It would be helpful to be able to store recognized entities in a database to be used later in the conversation in a bot action call or in a message.
E.g. "name" entity could be used in a message with "Hey there [name]" where [name] would get replaced with the said name. The name itself would be retrieved from a database of recognized entities.