Add request body models

Jellyfin.Api/Models/UserDtos/UpdateUserPassword.cs

@@ -0,0 +1,28 @@
+namespace Jellyfin.Api.Models.UserDtos
+{
+    /// <summary>
+    /// The update user password request body.
+    /// </summary>
+    public class UpdateUserPassword
+    {
+        /// <summary>
+        /// Gets or sets the current sha1-hashed password.
+        /// </summary>
+        public string? CurrentPassword { get; set; }
+
+        /// <summary>
+        /// Gets or sets the current plain text password.
+        /// </summary>
+        public string? CurrentPw { get; set; }
+
+        /// <summary>
+        /// Gets or sets the new plain text password.
+        /// </summary>
+        public string? NewPw { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether to reset the password.
+        /// </summary>
+        public bool ResetPassword { get; set; }
+    }
+}