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/WireGuardKit/DNSResolver.swift

@@ -4,6 +4,10 @@
 import Network
 import Foundation
 
+#if SWIFT_PACKAGE
+import WireGuardKitTypes
+#endif
+
 enum DNSResolver {}
 
 extension DNSResolver {

Sources/WireGuardKit/PacketTunnelSettingsGenerator.swift

@@ -6,7 +6,7 @@ import Network
 import NetworkExtension
 
 #if SWIFT_PACKAGE
-import WireGuardKitC
+import WireGuardKitTypes
 #endif
 
 /// A type alias for `Result` type that holds a tuple with source and resolved endpoint.

Sources/WireGuardKit/WireGuardAdapter.swift

@@ -7,6 +7,7 @@ import NetworkExtension
 #if SWIFT_PACKAGE
 import WireGuardKitGo
 import WireGuardKitC
+import WireGuardKitTypes
 #endif
 
 public enum WireGuardAdapterError: Error {