Added login/register function. Implemented authentication. Started authorization

Moonlight.Shared/Http/Requests/Auth/LoginRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Moonlight.Shared.Http.Requests.Auth;
+
+public class LoginRequest
+{
+    [Required(ErrorMessage = "You need to provide an email address")]
+    [EmailAddress(ErrorMessage = "You need to provide a valid email address")]
+    public string Email { get; set; }
+    
+    [Required(ErrorMessage = "You need to provide a password")]
+    public string Password { get; set; }
+}

Moonlight.Shared/Http/Requests/Auth/RegisterRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Moonlight.Shared.Http.Requests.Auth;
+
+public class RegisterRequest
+{
+    [Required(ErrorMessage = "You need to provide an email address")]
+    [EmailAddress(ErrorMessage = "You need to provide a valid email address")]
+    public string Email { get; set; }
+    
+    [Required(ErrorMessage = "You need to provide a username")]
+    [RegularExpression("^[a-z][a-z0-9]*$", ErrorMessage = "Usernames can only contain lowercase characters and numbers and should not start with a number")]
+    public string Username { get; set; }
+    
+    [Required(ErrorMessage = "You need to provide a password")]
+    [MinLength(8, ErrorMessage = "Your password needs to be at least 8 characters long")]
+    [MaxLength(256, ErrorMessage = "Your password should not exceed the length of 256 characters")]
+    public string Password { get; set; }
+}

Moonlight.Shared/Http/Responses/Auth/LoginResponse.cs

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+namespace Moonlight.Shared.Http.Responses.Auth;
+
+public class LoginResponse
+{
+    public string Token { get; set; }
+}

Moonlight.Shared/Http/Responses/Auth/RegisterResponse.cs

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+namespace Moonlight.Shared.Http.Responses.Auth;
+
+public class RegisterResponse
+{
+    public string Token { get; set; }
+}