Move writeBinaryValue and SDK_BYTES asByteArrayUnsafe optimization to GC branch

Revert SDK_BYTES switch case to use the original writeValue(asByteBuffer())
path, matching the existing SimpleTypeJsonMarshaller.SDK_BYTES behavior.
Remove writeBinaryValue from StructuredJsonGenerator and SdkJsonGenerator
since it is no longer used on this branch.

The writeBinaryValue optimization (bypassing ByteBuffer allocation and
copyBytesFrom) will be introduced on alexwoo/json_huge_gc_opt alongside
the other allocation-reduction changes.

Author: alextwoods

core/protocols/aws-json-protocol/src/main/java/software/amazon/awssdk/protocols/json/SdkJsonGenerator.java

@@ -206,16 +206,6 @@ public StructuredJsonGenerator writeValue(ByteBuffer bytes) {
         return this;
     }
 
-    @Override
-    public StructuredJsonGenerator writeBinaryValue(byte[] bytes) {
-        try {
-            generator.writeBinary(bytes);
-        } catch (IOException e) {
-            throw new JsonGenerationException(e);
-        }
-        return this;
-    }
-
     @Override
     //TODO: This date formatting is coupled to AWS's format. Should generalize it
     public StructuredJsonGenerator writeValue(Instant instant) {

core/protocols/aws-json-protocol/src/main/java/software/amazon/awssdk/protocols/json/StructuredJsonGenerator.java

@@ -102,11 +102,6 @@ public StructuredJsonGenerator writeValue(ByteBuffer bytes) {
             return this;
         }
 
-        @Override
-        public StructuredJsonGenerator writeBinaryValue(byte[] bytes) {
-            return this;
-        }
-
         @Override
         public StructuredJsonGenerator writeValue(Instant instant) {
             return this;
@@ -174,15 +169,6 @@ default StructuredJsonGenerator writeValue(byte val) {
 
     StructuredJsonGenerator writeValue(ByteBuffer bytes);
 
-    /**
-     * Writes binary data directly from a byte array, avoiding the overhead of wrapping in a
-     * {@link ByteBuffer}. The default implementation wraps the array and delegates to
-     * {@link #writeValue(ByteBuffer)}.
-     */
-    default StructuredJsonGenerator writeBinaryValue(byte[] bytes) {
-        return writeValue(ByteBuffer.wrap(bytes));
-    }
-
     StructuredJsonGenerator writeValue(Instant instant);
 
     StructuredJsonGenerator writeNumber(String number);

core/protocols/aws-json-protocol/src/main/java/software/amazon/awssdk/protocols/json/internal/marshall/JsonProtocolMarshaller.java

@@ -389,7 +389,7 @@ private void marshallPayloadField(SdkField<?> field, Object val) {
                 break;
             case SDK_BYTES:
                 gen.writeFieldName(fieldName);
-                gen.writeBinaryValue(((SdkBytes) val).asByteArrayUnsafe());
+                gen.writeValue(((SdkBytes) val).asByteBuffer());
                 break;
             case SDK_POJO:
                 SimpleTypeJsonMarshaller.SDK_POJO.marshall((SdkPojo) val, marshallerContext,