Creation of Policies to handle access control to ressources

[eleonoreeuzenes]

Description

This PR introduces several improvements to the UserController and PostController to enhance security and data access control. It includes the implementation of Laravel policies for user access and refactoring of methods to leverage these policies.

Changes Made

• Added Laravel policies for User and Post models: Created UserPolicyand PostPolicy to handle authorization logic.
• Refactored UserControllerand PostController: Updated methods to use policies for access control.

Motivation

For better control over user and post access, policies are now used to centralize and standardize authorization checks. This improves security by ensuring that access permissions are consistently applied and reduces code duplication.

[AugustinSeguin]

il faudrait faire la même chose pour UserPostParticipationController.php ;)