Cached relay metadata

damus/Util/Relays/RelayMetadatas.swift

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+//
+//  RelayMetadatas.swift
+//  damus
+//
+//  Created by William Casarin on 2023-02-09.
+//
+
+import Foundation
+
+class RelayMetadatas {
+    private var metadata: [String: RelayMetadata] = [:]
+    
+    func lookup(relay_id: String) -> RelayMetadata? {
+        return metadata[relay_id]
+    }
+    
+    func insert(relay_id: String, metadata: RelayMetadata) {
+        self.metadata[relay_id] = metadata
+    }
+}