chore: Rename to IStep (#10644)

Rename to `IStep`

Author: rubo

src/Nethermind/Nethermind.Api/Steps/IEthereumRunnerStep.cs

@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2022 Demerzel Solutions Limited
+// SPDX-License-Identifier: LGPL-3.0-only
+
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Nethermind.Api.Steps;
+
+public interface IStep
+{
+    Task Execute(CancellationToken cancellationToken);
+
+    public bool MustInitialize => true;
+}