William Casarin a28db5d330 local thread subscriptions ...

This adds local nostrdb thread subscriptions. When navigating to a
thread, we first check to see if we have any active nostrdb
subscriptions for that thread. If not, we create a new subscription. If
we do, we re-use that subscription.

This works by storing thread state in the Threads struct in the Damus
application state.

When we pop a route, we check to see if its a thread route. If it is,
then we try to unsubscribe, but only if that is the last remaining
subscriber for that thread, as there could be more than one.

Signed-off-by: William Casarin <jb55@jb55.com>

2024-07-31 13:51:24 -07:00

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