Create a Python class called BankAccount that simulates a simple bank account. The class should have the following functionalities:

1. It should have a constructor that accepts the account_holder name and initial balance (initial_balance), setting the balance to zero if the initial balance is not provided.

• another attribute account_number should be set automatically inside the initializer , auto generated bank account number. make sure it is 10 numbers and unique (not generated before for another account)

2. A method called deposit that accepts an amount and adds it to the account balance, and then returns the updated balance.
3. A method called withdraw that accepts an amount and subtracts it from the account balance, returning the updated balance, but only if there are sufficient funds in the account. If there are insufficient funds, it should print an error message and leave the balance unchanged.
4. A method called get_balance that returns the current account balance.
5. A method called get_account_holder that returns the name of the account holder.
6. A method called get_account_number that returns the number of the account holder.

Create a Python program to manage a list of accounts using classes and persist to file storage using pickle module. The program will allow Bank managers to add new accounts, display the list of accounts, and save/load the accounts from a file, search for an account, delete an account, update an account.

The AccountManager class should have the following methods:

• add_account(self, bank_account: BankAccount): Adds a bank account to the collection.
• display_accounts(self): Displays all accounts in the collection.
• search_accounts(self, account_number): searches for an account using the account number.
• delete_account(self, account_number): delete the account from the AccountManager collection using the account number.
• save_to_file(self, filename: str): Saves the list of accounts to a pickle file.
• load_from_file(self, filename: str): Loads the list of acounts from a pickle file.

• The save_to_file method should serialize the list of bank accounts to a pickle file.
• The load_from_file method should deserialize the pickle file and recreate the list of bank accounts.

• Provide a menu for the user to choose actions: add a bank account, display bank accounts, search for a bank account, delete a bank account , or exit.
• Implement the logic to handle each menu option.
• Use good practices, such as handling exceptions using Try...Except