Kit: move types from WireGuardKit to WireGuardKitTypes.

This prevents linking against wg-go when 3rd-party application needs to
use the WireGuardKit types from within the main bundle, therefore
prevents wg-go from spinning off Golang threads where not applicable.

Signed-off-by: Andrej Mihajlov <and@mullvad.net>

Sources/WireGuardKitTypes/TunnelConfiguration.swift

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
+
+import Foundation
+
+public final class TunnelConfiguration {
+    public var name: String?
+    public var interface: InterfaceConfiguration
+    public let peers: [PeerConfiguration]
+
+    public init(name: String?, interface: InterfaceConfiguration, peers: [PeerConfiguration]) {
+        self.interface = interface
+        self.peers = peers
+        self.name = name
+
+        let peerPublicKeysArray = peers.map { $0.publicKey }
+        let peerPublicKeysSet = Set<PublicKey>(peerPublicKeysArray)
+        if peerPublicKeysArray.count != peerPublicKeysSet.count {
+            fatalError("Two or more peers cannot have the same public key")
+        }
+    }
+}
+
+extension TunnelConfiguration: Equatable {
+    public static func == (lhs: TunnelConfiguration, rhs: TunnelConfiguration) -> Bool {
+        return lhs.name == rhs.name &&
+            lhs.interface == rhs.interface &&
+            Set(lhs.peers) == Set(rhs.peers)
+    }
+}