Update on "[ET-VK] Introduce generalized shaders for transfer ops and use it for select and slice"

## Changes

* Introduce `transfer_buffer.glsl` and `transfer_texture.glsl`, and `Transfer.cpp` which generalizes shaders where each element of the output is copied from a unique element of the input.
* Update `Slice.cpp` and `Select.cpp` to use `Transfer.cpp`
* Remove old implementations of slice and select

## Motivation

With this new implementation, the op can now support both buffers and textures of any packing. There are also benefits of code consolidation.

Differential Revision: [D75686050](https://our.internmc.facebook.com/intern/diff/D75686050/)

[ghstack-poisoned]

Author: SS-JIA

backends/vulkan/runtime/graph/ops/DispatchNode.cpp

@@ -75,10 +75,6 @@ void DispatchNode::encode(ComputeGraph* graph) {
 }
 
 void DispatchNode::write_push_constant_data() {
-  if (push_constants_.empty()) {
-    return;
-  }
-
   push_constants_offset_ = 0;
   for (const auto& push_constant : push_constants_) {
     push_constants_offset_ += push_constant.write(