feat: Implement dependency review and dependency submission APIs (#2932)

Implement dependency review and dependency submission

Co-authored-by: André Pereira <Andre.LuisPereira@Student.HTW-Berlin.de>

Octokit.Reactive/Clients/ObservableDependencyGraphClient.cs

@@ -0,0 +1,29 @@
+namespace Octokit.Reactive
+{
+    /// <summary>
+    /// A client for GitHub's Dependency Graph API.
+    /// </summary>
+    /// <remarks>
+    /// See the <a href="https://docs.github.com/en/rest/dependency-graph">Git Dependency Graph API documentation</a> for more information.
+    /// </remarks>
+    public class ObservableDependencyGraphClient : IObservableDependencyGraphClient
+    {
+        public ObservableDependencyGraphClient(IGitHubClient client)
+        {
+            Ensure.ArgumentNotNull(client, nameof(client));
+
+            //DependencyReview = new ObservableDependencyReviewClient(client);
+            DependencySubmission = new ObservableDependencySubmissionClient(client);
+        }
+
+        /// <summary>
+        /// Client for getting a dependency comparison between two commits.
+        /// </summary>
+        public IObservableDependencyReviewClient DependencyReview { get; private set; }
+
+        /// <summary>
+        /// Client for submitting dependency snapshots.
+        /// </summary>
+        public IObservableDependencySubmissionClient DependencySubmission { get; private set; }
+    }
+}