Implement missing IEquatable<> interfaces (#661)

+semver:minor

Author: hazzik

src/FluentNHibernate/Conventions/Inspections/Cascade.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class Cascade
+public class Cascade : IEquatable<Cascade>
 {
     public static readonly Cascade Unset = new Cascade("");
     public static readonly Cascade All = new Cascade("all");

src/FluentNHibernate/Conventions/Inspections/Fetch.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class Fetch
+public class Fetch : IEquatable<Fetch>
 {
     public static readonly Fetch Unset = new Fetch("");
     public static readonly Fetch Select = new Fetch("select");

src/FluentNHibernate/Conventions/Inspections/Generated.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class Generated
+public class Generated : IEquatable<Generated>
 {
     /// <summary>
     /// Use the default value.

src/FluentNHibernate/Conventions/Inspections/Include.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class Include
+public class Include : IEquatable<Include>
 {
     public static readonly Include Unset = new Include("");
     public static readonly Include All = new Include("all");

src/FluentNHibernate/Conventions/Inspections/NotFound.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class NotFound
+public class NotFound : IEquatable<NotFound>
 {
     public static readonly NotFound Unset = new NotFound("");
     public static readonly NotFound Ignore = new NotFound("ignore");

src/FluentNHibernate/Conventions/Inspections/OnDelete.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class OnDelete
+public class OnDelete : IEquatable<OnDelete>
 {
     public static readonly OnDelete Unset = new OnDelete("");
     public static readonly OnDelete Cascade = new OnDelete("cascade");

src/FluentNHibernate/Conventions/Inspections/OptimisticLock.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class OptimisticLock
+public class OptimisticLock : IEquatable<OptimisticLock>
 {
     public static readonly OptimisticLock Unset = new OptimisticLock("");
     public static readonly OptimisticLock None = new OptimisticLock("none");

src/FluentNHibernate/Conventions/Inspections/Polymorphism.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class Polymorphism
+public class Polymorphism : IEquatable<Polymorphism>
 {
     public static readonly Polymorphism Unset = new Polymorphism("");
     public static readonly Polymorphism Implicit = new Polymorphism("implicit");

src/FluentNHibernate/Conventions/Inspections/SchemaAction.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace FluentNHibernate.Conventions.Inspections;
 
-public class SchemaAction
+public class SchemaAction : IEquatable<SchemaAction>
 {
     public static readonly SchemaAction Unset = new SchemaAction("");
     public static readonly SchemaAction Drop = new SchemaAction("drop");

src/FluentNHibernate/Diagnostics/SkippedAutomappingType.cs

@@ -2,7 +2,7 @@
 
 namespace FluentNHibernate.Diagnostics;
 
-public class SkippedAutomappingType
+public class SkippedAutomappingType : IEquatable<SkippedAutomappingType>
 {
     public Type Type { get; set; }
     public string Reason { get; set; }