invalidate user cache when adding new user

tools/walletextension/storage/storage_with_cache.go

@@ -1,6 +1,8 @@
 package storage
 
 import (
+	"fmt"
+
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ten-protocol/go-ten/go/common/viewingkey"
 	"github.com/ten-protocol/go-ten/tools/walletextension/cache"
@@ -29,7 +31,14 @@ func NewUserStorageWithCache(storage UserStorage, logger log.Logger) (*UserStora
 
 // AddUser adds a new user and invalidates the cache for the userID
 func (s *UserStorageWithCache) AddUser(userID []byte, privateKey []byte) error {
-	return s.storage.AddUser(userID, privateKey)
+	fmt.Printf("Adding user %s to CosmosDB\n", userID)
+	err := s.storage.AddUser(userID, privateKey)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("User %s added to CosmosDB successfully\n", userID)
+	s.cache.Remove(userID)
+	return nil
 }
 
 // DeleteUser deletes a user and invalidates the cache for the userID