Update on "[ET-VK] Deserialize VkGraph in ET-VK"

Add logic to deserialize a VkGraph blob back python object. This allows us to get a implement debugging / visualization directly on the vulkan-exported program.  Still extra works need to be done: From the entire bundle, need to extract the specific vulkan delegate first.

Differential Revision: [D66443780](https://our.internmc.facebook.com/intern/diff/D66443780/)

[ghstack-poisoned]

Author: yipjustin

backends/vulkan/serialization/vulkan_graph_serialize.py

@@ -41,6 +41,8 @@ def convert_to_flatbuffer(vk_graph: VkGraph) -> bytes:
 
 
 def flatbuffer_to_vk_graph(flatbuffers: bytes) -> VkGraph:
+    # Following similar (de)serialization logic on other backends:
+    # https://github.com/pytorch/executorch/blob/main/backends/qualcomm/serialization/qc_schema_serialize.py#L33
     with tempfile.TemporaryDirectory() as d:
         schema_path = os.path.join(d, "schema.fbs")
         with open(schema_path, "wb") as schema_file: