Convert the `Conversations` component into a freestanding struct.

Unlike the previous example, this involves cloning an event broadcaster, as well. This is, per the documentation, how the type may be used. From <https://docs.rs/tokio/latest/tokio/sync/broadcast/fn.channel.html>:

> The Sender can be cloned to send to the same channel from multiple points in the process or it can be used concurrently from an `Arc`.

The language is less firm than the language sqlx uses for its pool, but the intent is clear enough, and it works in practice.

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