Support GRAPH.DELETE returning boolean (#152)

* change graph.Delete returned value to bool

* delete comments

Author: shacharPash

src/NRedisStack/Graph/GraphCommands.cs

@@ -85,15 +85,11 @@ public ResultSet CallProcedure(string graphName, string procedure, IEnumerable<s
         }
 
         /// <inheritdoc/>
-        public ResultSet Delete(string graphName)
+        public bool Delete(string graphName)
         {
-            var result = _db.Execute(GraphCommandBuilder.Delete(graphName));
-
-            var processedResult = new ResultSet(result, _graphCaches[graphName]);
-
+            var result = _db.Execute(GraphCommandBuilder.Delete(graphName)).OKtoBoolean();
             _graphCaches.Remove(graphName);
-
-            return processedResult;
+            return result;
         }
 
         /// <inheritdoc/>

src/NRedisStack/Graph/GraphCommandsAsync.cs

@@ -87,15 +87,11 @@ public async Task<ResultSet> CallProcedureAsync(string graphName, string procedu
 
 
         /// <inheritdoc/>
-        public async Task<ResultSet> DeleteAsync(string graphName)
+        public async Task<bool> DeleteAsync(string graphName)
         {
-            var result = await _db.ExecuteAsync(GRAPH.DELETE, graphName);
-
-            var processedResult = new ResultSet(result, _graphCaches[graphName]);
-
+            var result = (await _db.ExecuteAsync(GraphCommandBuilder.Delete(graphName))).OKtoBoolean();
             _graphCaches.Remove(graphName);
-
-            return processedResult;
+            return result;
         }
 
         /// <inheritdoc/>

src/NRedisStack/Graph/IGraphCommands.cs

@@ -79,9 +79,9 @@ public interface IGraphCommands
         /// Delete an existing graph.
         /// </summary>
         /// <param name="graphName">The graph to delete.</param>
-        /// <returns>A result set.</returns>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/graph.delete"/></remarks>
-        ResultSet Delete(string graphName);
+        bool Delete(string graphName);
 
         /// <summary>
         /// Constructs a query execution plan but does not run it. Inspect this execution plan to better understand how your

src/NRedisStack/Graph/IGraphCommandsAsync.cs

@@ -79,9 +79,9 @@ public interface IGraphCommandsAsync
         /// Delete an existing graph.
         /// </summary>
         /// <param name="graphName">The graph to delete.</param>
-        /// <returns>A result set.</returns>
+        /// <returns><see langword="true"/> if executed correctly, error otherwise/></returns>
         /// <remarks><seealso href="https://redis.io/commands/graph.delete"/></remarks>
-        Task<ResultSet> DeleteAsync(string graphName);
+        Task<bool> DeleteAsync(string graphName);
 
         /// <summary>
         /// Constructs a query execution plan but does not run it. Inspect this execution plan to better understand how your