Update on "[ET-VK] Implement prepack nodes"

## Context

This diff implements the idea described in the previous diff in this stack. During export, `et_vk.prepack` nodes will be inserted to convert constant tensors to GPU tensor objects. This makes it so that Vulkan operators will not have to account for the possibility that their arguments can potentially be constant tensor data instead of an actual tensor object.

Differential Revision: [D64603666](https://our.internmc.facebook.com/intern/diff/D64603666/)

[ghstack-poisoned]

Author: SS-JIA

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

@@ -51,8 +51,11 @@ void add_binary_op_node(
     const ValueRef alpha,
     const ValueRef out,
     const std::string& op_name) {
-  vTensorPtr t_in1 = graph.get_tensor(in1);
-  vTensorPtr t_in2 = graph.get_tensor(in2);
+  ValueRef arg1 = prepack_standard_like(graph, in1, out, true);
+  ValueRef arg2 = prepack_standard_like(graph, in2, out, true);
+
+  vTensorPtr t_in1 = graph.get_tensor(arg1);
+  vTensorPtr t_in2 = graph.get_tensor(arg2);
   vTensorPtr t_out = graph.get_tensor(out);
 
   check_binary_op_args(*t_in1, *t_in2, *t_out);
@@ -78,7 +81,7 @@ void add_binary_op_node(
       graph.create_local_wg_size(out),
       // Inputs and Outputs
       {{out, vkapi::MemoryAccessType::WRITE},
-       {{in1, in2}, vkapi::MemoryAccessType::READ}},
+       {{arg1, arg2}, vkapi::MemoryAccessType::READ}},
       // Shader params buffers
       {t_out->sizes_ubo(),
        t_out->axis_map_ubo(),