WIP: Upgrade NostrDB + new experimental architecture approaching local relay model

[danieldaquino]

Summary

⚠️ Very very WIP. Experimental. Multiple issues. Do not merge.

This is an experimental branch containing the latest NostrDB update branch: #2121
and the new architecture approaching the local relay model #2911.

This branch approaches the local relay model. To implement the local relay model (or a first prototype of it), we would need a patch similar to the following:

diff --git a/damus/Models/NostrNetworkManager/NostrNetworkManager.swift b/damus/Models/NostrNetworkManager/NostrNetworkManager.swift
index 1ce18479..9e3ab41c 100644
--- a/damus/Models/NostrNetworkManager/NostrNetworkManager.swift
+++ b/damus/Models/NostrNetworkManager/NostrNetworkManager.swift
@@ -56,7 +56,27 @@ actor NostrNetworkManager {
     
     /// Subscribes to data from Nostr
     func subscribe(filters: [NostrFilter], to: [RelayURL]? = nil) -> AsyncStream<RelayPool.StreamItem> {
-        return self.pool.subscribe(filters: filters, to: to)
+        return AsyncStream<RelayPool.StreamItem> { continuation in
+            let ndbStreamTask = Task {
+                for await ndbEvent in ndb.query(filters) {
+                    continuation.yield(.event(ndbEvent))
+                }
+                continuation.yield(.eose)
+                for await ndbEvent in ndb.stream(filters) {
+                    continuation.yield(ndbEvent)
+                }
+            }
+            let networkStreamTask = Task {
+                for await item in pool.subscribe(filters) {
+                    guard case .event(let event) = item else { continue }
+                    ndb.ingest(event)
+                }
+            }
+            continuation.onTermination = {
+                ndbStreamTask.cancel()
+                networkStreamTask.cancel()
+            }
+        }
     }
     
     func query(filters: [NostrFilter], to: [RelayURL]? = nil) async -> [NostrEvent] {

However, to apply this patch, we still need to create the interface that will allow us to use ndb_query and ndb_subscribe using the same types we use on Swift (e.g. NostrFilter, NdbNote, etc) — which is non-trivial.

Checklist

• I have read (or I am familiar with) the Contribution Guidelines
• I have tested the changes in this PR
• I have opened or referred to an existing github issue related to this change.
• My PR is either small, or I have split it into smaller logical commits that are easier to review
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• I have added appropriate changelog entries for the changes in this PR. See Adding changelog entries
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• I have added appropriate Closes: or Fixes: tags in the commit messages wherever applicable, or made sure those are not needed. See Submitting patches

Test report

Please provide a test report for the changes in this PR. You can use the template below, but feel free to modify it as needed.

Device: [Please specify the device you used for testing]

iOS: [Please specify the iOS version you used for testing]

Damus: [Please specify the Damus version or commit hash you used for testing]

Setup: [Please provide a brief description of the setup you used for testing, if applicable]

Steps: [Please provide a list of steps you took to test the changes in this PR]

Results:

• PASS
• Partial PASS
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Other notes

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[jb55]

we should get nostrdb updated and merged first before attempting this IMO