Sketch out Bmp implementation

Author: JimBobSquarePants

src/ImageSharp/Formats/Bmp/BmpMetadata.cs

@@ -1,12 +1,12 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 namespace SixLabors.ImageSharp.Formats.Bmp;
 
 /// <summary>
 /// Provides Bmp specific metadata information for the image.
 /// </summary>
-public class BmpMetadata : IDeepCloneable
+public class BmpMetadata : IFormatMetadata<BmpMetadata>, IFormatFrameMetadata<BmpMetadata>
 {
     /// <summary>
     /// Initializes a new instance of the <see cref="BmpMetadata"/> class.
@@ -36,7 +36,26 @@ private BmpMetadata(BmpMetadata other)
     public BmpBitsPerPixel BitsPerPixel { get; set; } = BmpBitsPerPixel.Pixel24;
 
     /// <inheritdoc/>
-    public IDeepCloneable DeepClone() => new BmpMetadata(this);
+    public static BmpMetadata FromFormatConnectingMetadata(FormatConnectingMetadata metadata)
+        => throw new NotImplementedException();
+
+    /// <inheritdoc/>
+    public static BmpMetadata FromFormatConnectingFrameMetadata(FormatConnectingFrameMetadata metadata)
+        => throw new NotImplementedException();
+
+    /// <inheritdoc/>
+    public FormatConnectingMetadata ToFormatConnectingMetadata()
+        => throw new NotImplementedException();
+
+    /// <inheritdoc/>
+    public FormatConnectingFrameMetadata ToFormatConnectingFrameMetadata()
+        => throw new NotImplementedException();
+
+    /// <inheritdoc/>
+    public IDeepCloneable DeepClone() => ((IDeepCloneable<BmpMetadata>)this).DeepClone();
+
+    /// <inheritdoc/>
+    BmpMetadata IDeepCloneable<BmpMetadata>.DeepClone() => new(this);
 
     // TODO: Colors used once we support encoding palette bmps.
 }

src/ImageSharp/Formats/IFormatFrameMetadata.cs

@@ -19,7 +19,7 @@ public interface IFormatFrameMetadata : IDeepCloneable
 /// An interface that provides metadata for a specific image format frames.
 /// </summary>
 /// <typeparam name="TSelf">The metadata type implementing this interface.</typeparam>
-public interface IFormatFrameMetadata<TSelf> : IFormatMetadata, IDeepCloneable<TSelf>
+public interface IFormatFrameMetadata<TSelf> : IFormatFrameMetadata, IDeepCloneable<TSelf>
     where TSelf : class, IFormatFrameMetadata, new()
 {
     /// <summary>