Introduce MaybeCompatible property to ItemMetadata

The `MaybeCompatible` property attempts to determine whether a compatible or convertible member is available on a corresponding topic. This is useful as a quick heuristic for weeding out cases where compatibility is unexpected. Due to limitations of the implementation, it cannot guarantee compatibility—or incompatibility—since it doesn't know the source topic type. But, for our purposes, it should be good enough at indicating whether compatibility is likely.

The will provide the foundation for #Feature #102.

Author: JeremyCaney

OnTopic/Internal/Reflection/ItemMetadata.cs

@@ -155,6 +155,36 @@ internal ItemConfiguration Configuration {
     /// </summary>
     internal bool IsConvertible { get; init; }
 
+    /*==========================================================================================================================
+    | MAYBE COMPATIBLE?
+    \-------------------------------------------------------------------------------------------------------------------------*/
+    /// <summary>
+    ///   Determine if the item corresponds to a member on the <see cref="Topic"/> class (or derivative) associated with the
+    ///   parent <see cref="TypeAccessor"/>.
+    /// </summary>
+    /// <remarks>
+    ///   <para>
+    ///     The <see cref="MaybeCompatible"/> does not <i>guarantee</i> that a corresponding compatible property will be found.
+    ///     First, it cannot know what the source <see cref="Topic"/> will be, so it relies only evaluates topics who match the
+    ///     naming convention (e.g., <c>{ContentType}TopicViewModel</c> maps to <c>{ContentType}</c>), and otherwise falls back
+    ///     to <see cref="Topic"/>; if a model is mapped to a different derivative of <see cref="Topic"/>, additional matches
+    ///     may be available. Second, it evaluates whether the <see cref="Topic"/> member is of a type that can be assigned to
+    ///     the model member, or otherwise <i>converted</i>—i.e., that the <see cref="Topic"/> member is a string, and the model
+    ///     member is one of the <see cref="AttributeValueConverter.ConvertibleTypes"/>. This provides a hint for avoiding type
+    ///     checks in cases we don't expect to be compatible, while deferring to the caller to provide more sophisticated checks
+    ///     based on the actual <see cref="Topic"/>.
+    ///   </para>
+    ///   <para>
+    ///     The <see cref="MaybeCompatible"/> property must be set from the <see cref="TypeAccessor"/>, which is best positioned
+    ///     to efficiently determine the corresponding attributes. To do this, it must rely on attributes accessed via the <see
+    ///     cref="Configuration"/> property. As a result, the <see cref="MaybeCompatible"/> must be set <i>after</i> the <see
+    ///     cref="ItemMetadata"/> instance has been constructed, instead of during initialization like the other properties.
+    ///     That isn't ideal, but isn't easy to avoid without making each <see cref="ItemMetadata"/> aware of the parent <see
+    ///     cref="TypeAccessor"/>.
+    ///   </para>
+    /// </remarks>
+    internal bool MaybeCompatible { get; set; }
+
     /*==========================================================================================================================
     | CUSTOM ATTRIBUTES
     \-------------------------------------------------------------------------------------------------------------------------*/