Update on "[ET-VK][10/n] copy node, aten.repeat"

1. Introduce a `CopyNode` for generic copy-with-offset operations.
2. `aten.repeat` on all dimensions.
2.1 Use `CopyNode` where possible.
2.2. Specialized `repeat_channel` shader to handle packings
3. Update codegen to support `Methods` variant only operations. Need a new route to trigger the dispatch.

Differential Revision: [D56499329](https://our.internmc.facebook.com/intern/diff/D56499329/)

[ghstack-poisoned]

Author: yipjustin

backends/vulkan/runtime/graph/ops/impl/Copy.cpp

@@ -8,15 +8,10 @@
 
 #include <executorch/backends/vulkan/runtime/graph/ops/OperatorRegistry.h>
 
-#include <executorch/backends/vulkan/runtime/api/api.h>
-#include <executorch/backends/vulkan/runtime/graph/Logging.h>
-
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/utils/KernelUtils.h>
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/utils/TensorUtils.h>
 #include <executorch/backends/vulkan/runtime/graph/ops/utils/ShaderNameUtils.h>
 
-#include <iostream>
-
 namespace vkcompute {
 
 void add_copy_offset_node(