Update base for 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/VulkanBackend.cpp

@@ -499,6 +499,10 @@ class VulkanBackend final : public ::executorch::runtime::BackendInterface {
     compute_graph->encode_prepack();
     compute_graph->prepack();
 
+    // TODO(ssjia): remove this once we can batch compile compute pipelines
+    // during prepare().
+    compute_graph->encode_execute();
+
     return Error::Ok;
   }
 
@@ -572,12 +576,7 @@ class VulkanBackend final : public ::executorch::runtime::BackendInterface {
     if (should_propagate_resize) {
       compute_graph->propagate_resize();
     }
-    // If propagate_resize() was not triggered (i.e. command buffer has not been
-    // encoded), then make sure to encode the command buffer before executing
-    // the first inference of the model.
-    else if (compute_graph->execute_count() == 0) {
-      compute_graph->encode_execute();
-    }
+
     compute_graph->execute();
 
     for (size_t i = 0; i < compute_graph->outputs().size(); i++) {