Exclude record members from TypeAccessor

The C# compiler automatically adds a number of members to `record` types, such as an `EqualityContract` and `ToString()`. These aren't relevant to either dispatch or mapping operations, and just add noise to the cache. These can be excluded. To ensure this works, I've converted `CustomTopicTopicViewModel` (5310655) to a `record` so its `MaybeCompatible` checks can validate whether there are any unexpected members.

While I was at it, I also consolidated all of the escape clauses in `IsValid()` into a single block for readability and succinctness.

Author: JeremyCaney

OnTopic.Tests/ViewModels/CustomTopicTopicViewModel.cs

@@ -27,7 +27,7 @@ namespace OnTopic.Tests.ViewModels {
   ///     of the test case, and not something we'd expect in real-life scenarios.
   ///   </para>
   /// </remarks>
-  public class CustomTopicTopicViewModel {
+  public record CustomTopicTopicViewModel {
 
     /*==========================================================================================================================
     | CONSTRUCTOR

OnTopic/Internal/Reflection/MemberAccessor.cs

@@ -233,6 +233,21 @@ internal void Validate(object target) {
       }
     }
 
+    /*==========================================================================================================================
+    | EXCLUDED MEMBERS
+    \-------------------------------------------------------------------------------------------------------------------------*/
+    /// <summary>
+    ///   Provides a list of member names automatically generated by the compiler for <c>record</c> types, but which aren't
+    ///   relevant to mapping and should be excluded.
+    /// </summary>
+    private static List<string> ExcludedMembers { get; } = new List<string>() {
+      "EqualityContract",
+      "GetHashCode",
+      "ToString",
+      "<Clone>$"
+    };
+
+
     /*==========================================================================================================================
     | IS VALID?
     \-------------------------------------------------------------------------------------------------------------------------*/
@@ -247,23 +262,20 @@ internal void Validate(object target) {
     internal static Func<MemberInfo, bool> IsValid => memberInfo => {
 
       /*------------------------------------------------------------------------------------------------------------------------
-      | Skip members inherited from object
+      | Exclude unsupported types and members
       \-----------------------------------------------------------------------------------------------------------------------*/
       if (memberInfo.DeclaringType == typeof(object)) return false;
-
-      /*------------------------------------------------------------------------------------------------------------------------
-      | Ensure type is property or method
-      \-----------------------------------------------------------------------------------------------------------------------*/
       if (memberInfo is not MethodInfo and not PropertyInfo) return false;
+      if (memberInfo.Name.Contains("et_", StringComparison.Ordinal)) return false;
+      if (ExcludedMembers.Contains(memberInfo.Name)) return false;
 
       /*------------------------------------------------------------------------------------------------------------------------
       | Validate properties
       \-----------------------------------------------------------------------------------------------------------------------*/
-      if (memberInfo.Name.Contains("et_", StringComparison.Ordinal)) return false;
       if (memberInfo is PropertyInfo) return true;
 
       /*------------------------------------------------------------------------------------------------------------------------
-      | Validate methods
+      | Establish method variables
       \-----------------------------------------------------------------------------------------------------------------------*/
       var methodInfo            = (MethodInfo)memberInfo;
       var parameters            = methodInfo.GetParameters();