Add refresh token entity and authentication models

- Introduced RefreshToken entity for storing refresh tokens with user association and revocation support.
- Added LoginResponse, RefreshTokenRequest, and UsernameLoginRequest models for authentication workflows.
- Added GlobalSuppressions.cs to suppress CA1873 warning on AddEasyStack method.

Author: Vadim Belov

Sources/EasyExtensions.AspNetCore.Stack/GlobalSuppressions.cs

@@ -0,0 +1,8 @@
+// This file is used by Code Analysis to maintain SuppressMessage
+// attributes that are applied to this project.
+// Project-level suppressions either have no target or are given
+// a specific target and scoped to a namespace, type, member, etc.
+
+using System.Diagnostics.CodeAnalysis;
+
+[assembly: SuppressMessage("Performance", "CA1873:Avoid potentially expensive logging", Justification = "<Pending>", Scope = "member", Target = "~M:EasyExtensions.AspNetCore.Stack.Extensions.HostApplicationBuilderExtensions.AddEasyStack(Microsoft.Extensions.Hosting.IHostApplicationBuilder,System.Action{EasyExtensions.AspNetCore.Stack.Builders.EasyStackOptions})~Microsoft.Extensions.Hosting.IHostApplicationBuilder")]

Sources/EasyExtensions.EntityFrameworkCore/Database/RefreshToken.cs

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+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+using EasyExtensions.EntityFrameworkCore.Abstractions;
+
+namespace EasyExtensions.EntityFrameworkCore.Database
+{
+    /// <summary>
+    /// Represents a refresh token used to obtain new access tokens for a user in authentication workflows.
+    /// </summary>
+    /// <remarks>A refresh token is typically issued alongside an access token and allows clients to request
+    /// new access tokens without requiring the user to re-authenticate. Each refresh token is associated with a
+    /// specific user and can be revoked to prevent further use.</remarks>
+    [Table("refresh_tokens")]
+    [Index(nameof(Token), IsUnique = true)]
+    public class RefreshToken : BaseEntity<Guid>
+    {
+        /// <summary>
+        /// Gets or sets the unique identifier for the user.
+        /// </summary>
+        [Column("user_id")]
+        public Guid UserId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the authentication token associated with the entity.
+        /// </summary>
+        [Column("token")]
+        public string Token { get; set; } = null!;
+
+        /// <summary>
+        /// Gets or sets the date and time when the entity was revoked. Stored in UTC.
+        /// </summary>
+        [Column("revoked_at")]
+        public DateTime? RevokedAt { get; set; }
+    }
+}

Sources/EasyExtensions/Models/LoginResponse.cs

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+namespace EasyExtensions.Models
+{
+    /// <summary>
+    /// Represents the result of a successful authentication request, including access and refresh tokens.
+    /// </summary>
+    public class LoginResponse
+    {
+        /// <summary>
+        /// Gets or sets the access token used for authenticating requests.
+        /// </summary>
+        public string AccessToken { get; set; } = null!;
+
+        /// <summary>
+        /// Gets or sets the refresh token used to obtain a new access token when the current token expires.
+        /// </summary>
+        public string? RefreshToken { get; set; }
+    }
+}

Sources/EasyExtensions/Models/RefreshTokenRequest.cs

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+namespace EasyExtensions.Models
+{
+    /// <summary>
+    /// Gets or sets the refresh token used to obtain a new access token.
+    /// </summary>
+    public class RefreshTokenRequest
+    {
+        /// <summary>
+        /// Gets or sets the refresh token used to obtain a new access token when the current access token expires.
+        /// </summary>
+        public string? RefreshToken { get; set; }
+    }
+}

Sources/EasyExtensions/Models/UsernameLoginRequest.cs

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+namespace EasyExtensions.Models
+{
+    /// <summary>
+    /// Represents a request to authenticate a user using a username and password.
+    /// </summary>
+    public class UsernameLoginRequest
+    {
+        /// <summary>
+        /// Gets or sets the username associated with the account.
+        /// </summary>
+        public string Username { get; set; } = null!;
+
+        /// <summary>
+        /// Gets or sets the password associated with the account or resource.
+        /// </summary>
+        public string Password { get; set; } = null!;
+    }
+}