How to use the Symfony security component to authenticate users?

@daisha 

The Symfony security component provides a set of tools to manage user authentication, authorization, and access control. Here are the steps to authenticate users using Symfony security:

1. Install the security component: If you're starting a new Symfony project, you can install the security component along with other necessary components using the Symfony CLI. Alternatively, you can install it manually using Composer.
2. Configure the security component: The security component requires some configuration to work properly. You need to configure authentication providers, firewalls, access control rules, and more. You can do this in the security.yaml file or in the security.php file, depending on your preference.
3. Implement a User class: You need to implement a User class that implements the UserInterface provided by Symfony. This class should represent the authenticated user and contain information about them, such as their username, password, and roles.
4. Create a login form: You can create a login form using Symfony forms that allows users to enter their username and password. This form should submit to a login controller that handles the authentication process.
5. Authenticate users: When a user submits the login form, the login controller should use the security component to authenticate the user. This involves validating the username and password against the user provider configured in the security component.
6. Manage user sessions: Once a user is authenticated, Symfony creates a session that identifies the user. You can manage this session to keep users logged in across requests.
7. Implement access control: The security component allows you to configure access control rules that define which users can access which routes or controllers. You can use roles or permissions to implement these rules.

Overall, the Symfony security component provides a powerful and flexible system for managing user authentication and access control in Symfony applications.