feat: Add instance level support for swift concurrency on `PortalsPub…

…Sub` (#81)

Sources/IonicPortals/PortalsPlugin+SwiftConcurrency.swift

@@ -9,12 +9,19 @@ import Foundation
 
 #if compiler(>=5.6) && canImport(_Concurrency)
 extension PortalsPubSub {
-    /// Subscribe to a topic and receive the events in an `AsyncStream`
+    /// Subscribe to a topic and receive the events in an `AsyncStream`. Uses ``shared`` to subscribe.
     /// - Parameter topic: The topic to subscribe to
     /// - Returns: An AsyncStream emitting ``SubscriptionResult``
     public static func subscribe(to topic: String) -> AsyncStream<SubscriptionResult> {
+        PortalsPubSub.shared.subscribe(to: topic)
+    }
+
+    /// Subscribe to a topic and receive the events in an `AsyncStream`
+    /// - Parameter topic: The topic to subscribe to
+    /// - Returns: An AsyncStream emitting ``SubscriptionResult``
+    public func subscribe(to topic: String) -> AsyncStream<SubscriptionResult> {
         AsyncStream { continuation in
-            let cancellable = PortalsPubSub.subscribe(to: topic) { result in
+            let cancellable = subscribe(to: topic) { result in
                 continuation.yield(result)
             }