Migrate project (branch RoleManager) net5.0 to net8.0

[AngeloDotNet]

No description provided.

[BrightSoul]

Ciao e grazie per la PR! Occhio, c'è il tuo nome e indirizzo email nel db, meglio rimuoverlo.
Casomai elimina e rigenera il db usando le migration, poi farò il merge.

[AngeloDotNet]

This pull request includes several changes to modernize the codebase by adopting file-scoped namespaces and updating the target framework. The most important changes include refactoring namespaces, updating the target framework, and cleaning up the code formatting.

Refactoring namespaces:

• Converted to file-scoped namespaces across multiple files for cleaner and more concise code. (Data/ApplicationDbContext.cs, Models/Authorization/PermissionAuthorizationHandler.cs, Models/Authorization/PermissionPolicyProvider.cs, Models/Authorization/PermissionRequirement.cs, Models/Entities/ApplicationRole.cs, Models/Entities/ApplicationUser.cs, Models/Enums/Permission.cs, Models/InputModels/EditClaimInputModel.cs, Models/InputModels/EditRoleInputModel.cs, Models/InputModels/RoleCreateInputModel.cs, Models/InputModels/RoleEditInfoInputModel.cs, Models/InputModels/UserCreateInputModel.cs, Models/InputModels/UserEditProfileInputModel.cs, Models/ViewModels/UserListViewModel.cs, Program.cs, Startup.cs) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]

Updating target framework:

• Updated the target framework from .NET 5.0 to .NET 8.0 in the project file. (UserManagementUiDemo.csproj)
• Updated the README to reflect the new target framework version. (README.md)

Code formatting improvements:

• Cleaned up and reformatted code for better readability and maintainability. (Startup.cs, Program.cs, Models/InputModels/UserCreateInputModel.cs) [1] [2] [3]