add some additional interfaces that will be mainly used to access pro…

…perties of user row

src/Serenity.Net.Entity/Contracts/IDisplayNameRow.cs

@@ -0,0 +1,12 @@
+namespace Serenity.Data;
+
+/// <summary>
+/// An interface to provide access to a display name field
+/// </summary>
+public interface IDisplayNameRow
+{
+    /// <summary>
+    /// Gets display name field
+    /// </summary>
+    StringField DisplayNameField { get; }
+}

src/Serenity.Net.Entity/Contracts/IEmailRow.cs

@@ -0,0 +1,12 @@
+namespace Serenity.Data;
+
+/// <summary>
+/// An interface that provides access to email field
+/// </summary>
+public interface IEmailRow
+{
+    /// <summary>
+    /// Gets email field
+    /// </summary>
+    StringField EmailField { get; }
+}

src/Serenity.Net.Entity/Contracts/IPasswordRow.cs

@@ -0,0 +1,17 @@
+namespace Serenity.Data;
+
+/// <summary>
+/// An interface that provides access to password hash and salt fields
+/// </summary>
+public interface IPasswordRow
+{
+    /// <summary>
+    /// Gets password hash field
+    /// </summary>
+    StringField PasswordHashField { get; }
+
+    /// <summary>
+    /// Gets password salt field
+    /// </summary>
+    StringField PasswordSaltField { get; }
+}