feature: Passing CustomId matches into contexts (#2136)

* add logic for passing the wild card captures into the context

* move concrete impl of IRouteSegmentMatch to internal

* Apply suggestions from code review

Co-authored-by: Quin Lynch <49576606+quinchs@users.noreply.github.com>

* fix build errors

* Apply suggestions from code review

Co-authored-by: Armano den Boef <68127614+Rozen4334@users.noreply.github.com>

Co-authored-by: Quin Lynch <49576606+quinchs@users.noreply.github.com>
Co-authored-by: Armano den Boef <68127614+Rozen4334@users.noreply.github.com>

src/Discord.Net.Rest/Interactions/RestInteractionContext.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.Threading.Tasks;
 
 namespace Discord.Rest
@@ -6,7 +8,7 @@ namespace Discord.Rest
     /// <summary>
     ///     Represents a Rest based context of an <see cref="IDiscordInteraction"/>.
     /// </summary>
-    public class RestInteractionContext<TInteraction> : IRestInteractionContext
+    public class RestInteractionContext<TInteraction> : IRestInteractionContext, IRouteMatchContainer
         where TInteraction : RestInteraction
     {
         /// <summary>
@@ -45,6 +47,9 @@ namespace Discord.Rest
         /// </remarks>
         public Func<string, Task> InteractionResponseCallback { get; set; }
 
+        /// <inheritdoc cref="IRouteMatchContainer.SegmentMatches"/>
+        public IReadOnlyCollection<IRouteSegmentMatch> SegmentMatches { get; private set; }
+
         /// <summary>
         ///     Initializes a new <see cref="RestInteractionContext{TInteraction}"/>. 
         /// </summary>
@@ -71,6 +76,13 @@ namespace Discord.Rest
             InteractionResponseCallback = interactionResponseCallback;
         }
 
+        /// <inheritdoc/>
+        public void SetSegmentMatches(IEnumerable<IRouteSegmentMatch> segmentMatches) => SegmentMatches = segmentMatches.ToImmutableArray();
+
+        //IRouteMatchContainer
+        /// <inheritdoc/>
+        IEnumerable<IRouteSegmentMatch> IRouteMatchContainer.SegmentMatches => SegmentMatches;
+
         // IInterationContext
         /// <inheritdoc/>
         IDiscordClient IInteractionContext.Client => Client;