feat(agent): add didcomm connection protocol and invitation protocol

PrismAgent/Sources/Protocols/Invitation/V2/InvitationRunner.swift

@@ -0,0 +1,17 @@
+import Domain
+import Foundation
+
+class InvitationRunner {
+    private let mercury: Mercury
+    private let url: URL
+
+    init(mercury: Mercury, url: URL) {
+        self.mercury = mercury
+        self.url = url
+    }
+
+    func run() async throws -> Message {
+        let messageString = try OutOfBandParser().parseMessage(url: url)
+        return try await mercury.unpackMessage(msg: messageString, options: .expectDecryptByAllKeys).result
+    }
+}