Add support for PKCE flow (#123)

* Add PKCE flow

* Fix tests

* Make some types internal and remove CodingKeys implementations

* Add PKCE to SupabaseClient

* Add debug log to GoTrueClient

* Use LockIsolated on GoTrueClient

* Support PKCE when signing in with redirect URL

Author: grdsdev

Examples/ProductSample/Application/AppView.swift

@@ -108,4 +108,4 @@ struct AppView: View {
   func notAuthenticatedView(model: AuthViewModel) -> some View {
     AuthView(model: model)
   }
-}
+}

Examples/ProductSample/Features/Auth/AuthView.swift

@@ -60,4 +60,4 @@ struct AuthView: View {
       Task { await model.onOpenURL(url) }
     }
   }
-}
+}

Examples/ProductSample/Features/ProductDetails/ProductDetailsView.swift

@@ -57,4 +57,4 @@ struct ProductDetailsView: View {
       }
     }
   }
-}
+}

Examples/ProductSample/Features/ProductList/ProductListView.swift

@@ -47,4 +47,4 @@ struct ProductListView: View {
       await model.loadProducts()
     }
   }
-}
+}