Update on "[ET-VK] Add PushConstantDataInfo and vector to hold push constants data in DispatchNode."

This diff adds a new class called `PushConstantDataInfo` to the `DispatchNode` class in the Vulkan backend for Executorch.
This class represents a push constant data entry, which can either be a shared pointer to a tensor's uniform data with an attribute or data with a maximum size of 16 bytes.
The `write` method is also added to this class, which writes the data to a destination buffer.

Differential Revision: [D66796049](https://our.internmc.facebook.com/intern/diff/D66796049/)

[ghstack-poisoned]

Author: trivedivivek

backends/arm/test/ops/test_to_copy.py

@@ -56,7 +56,6 @@ def _test_to_copy_tosa_MI_pipeline(
             )
             .export()
             .dump_artifact()
-            .check_count({"torch.ops.aten._to_copy.default": 1})
             .to_edge()
             .dump_artifact()
             .partition()