Data read write by okta OIDC is not compatible between versions (#313)

* Initial fix of mapping issue

* Add comments

* Method fix

Author: oleggnidets-okta

Sources/OktaOidc/Common/OktaOidcStateManager.swift

@@ -213,6 +213,8 @@ open class OktaOidcStateManager: NSObject, NSSecureCoding {
         }
 
         let state: OktaOidcStateManager?
+        prepareKeyedArchiver()
+      
         if #available(iOS 11, OSX 10.14, *) {
             state = (try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(encodedAuthState)) as? OktaOidcStateManager
         } else {
@@ -221,6 +223,22 @@ open class OktaOidcStateManager: NSObject, NSSecureCoding {
 
         return state
     }
+  
+    /// This method can be removed in the future with release 4.0.0 or higher.
+    /// Resolves OKTA-427089
+    private static func prepareKeyedArchiver() {
+        let classes = [OKTAuthorizationRequest.self, OKTAuthorizationResponse.self,
+                       OKTAuthState.self, OKTEndSessionRequest.self,
+                       OKTEndSessionResponse.self, OKTRegistrationRequest.self,
+                       OKTRegistrationResponse.self, OKTServiceConfiguration.self,
+                       OKTServiceDiscovery.self, OKTTokenRequest.self,
+                       OKTTokenResponse.self]
+        
+        for archivedClass in classes {
+            let className = "\(archivedClass)".replacingOccurrences(of: "OKT", with: "OID")
+            NSKeyedUnarchiver.setClass(archivedClass, forClassName: className)
+        }
+    }
 }
 
 internal extension OktaOidcStateManager {