Simplify the Ghostryde API

First step of RDE encoding refactoring.

Creates a single InputStream (OutputStream) to decode (encode) Ghostryde files.
This replaces the 3 InputStreams (OutputStreams) that were needed before.

Also removes a lot of classes, and removes the "injection" of the Ghostryde
class. It's an encoding, there's no point in injecting it.

Finally, removed the buffer-size configuration and replaced with a static final
const value. It's just a buffer size - it doesn't actually affect much. There
are much more "important" fields that weren't configured (such as the
compression algorithm and whether or not to do integrity checks)

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=202319102

java/google/registry/config/RegistryConfig.java

@@ -638,17 +638,6 @@ public final class RegistryConfig {
       return projectId + "-rde-import";
     }
 
-    /**
-     * Size of Ghostryde buffer in bytes for each layer in the pipeline.
-     *
-     * @see google.registry.rde.Ghostryde
-     */
-    @Provides
-    @Config("rdeGhostrydeBufferSize")
-    public static Integer provideRdeGhostrydeBufferSize() {
-      return 64 * 1024;
-    }
-
     /**
      * Amount of time between RDE deposits.
      *