Move console encoder to rendering namespace

src/Spectre.Console/Rendering/IAnsiConsoleEncoder.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+
+namespace Spectre.Console.Rendering
+{
+    /// <summary>
+    /// Represents a console encoder that can encode
+    /// recorded segments into a string.
+    /// </summary>
+    public interface IAnsiConsoleEncoder
+    {
+        /// <summary>
+        /// Encodes the specified segments.
+        /// </summary>
+        /// <param name="segments">The segments to encode.</param>
+        /// <returns>The encoded string.</returns>
+        string Encode(IEnumerable<Segment> segments);
+    }
+}