Add IUserRepository and implement UserRepository

Added the `IUserRepository` interface to define a method for retrieving authorized users asynchronously. Registered `IUserRepository` with its implementation `UserRepository` in the dependency injection container. Implemented `UserRepository` to execute a stored procedure and fetch authorized users using `TaskFlowDbContext`.

src/core/DigitalData.TaskFlow.Application/Common/Interfaces/IUserRepository.cs

@@ -0,0 +1,8 @@
+using DigitalData.TaskFlow.Domain.ProcedureResults;
+
+namespace DigitalData.TaskFlow.Application.Common.Interfaces;
+
+public interface IUserRepository : IRepository
+{
+    Task<IEnumerable<AuthorizedUser>> GetAuthorizedAsync(CancellationToken cancellationToken);
+}

src/infrastructure/DigitalData.TaskFlow.Infrastructure/DependencyInjection.cs

@@ -22,6 +22,7 @@ public static class DependencyInjection
 
         services.AddScoped<IWorkflowRepository, WorkflowRepository>();
         services.AddScoped<IDocumentRepository, DocumentRepository>();
+        services.AddScoped<IUserRepository, UserRepository>();
 
         return services;
     }

src/infrastructure/DigitalData.TaskFlow.Infrastructure/Repositories/UserRepository.cs

@@ -0,0 +1,17 @@
+using DigitalData.TaskFlow.Application.Common.Interfaces;
+using DigitalData.TaskFlow.Domain.ProcedureResults;
+using DigitalData.TaskFlow.Infrastructure.Persistence;
+using Microsoft.EntityFrameworkCore;
+
+namespace DigitalData.TaskFlow.Infrastructure.Repositories;
+
+public sealed class UserRepository(TaskFlowDbContext context) : IUserRepository
+{
+    public async Task<IEnumerable<AuthorizedUser>> GetAuthorizedAsync(CancellationToken cancellationToken)
+    {
+        return await context.AuthorizedUsers
+            .FromSqlInterpolated($"EXEC [dbo].[PRCUST_F19_GET_AUTHORIZED_USERS]")
+            .AsNoTracking()
+            .ToListAsync(cancellationToken);
+    }
+}