[ET-VK][examples] Create export script for Vulkan examples

[SS-JIA]

Summary:
Title says it all!

Introduce scripts to facilitate exporting and testing Vulkan delegate models. These scripts will be used in the next PR to add CI testing for Vulkan lowered models.

cc @manuelcandales @cbilgin

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [DNL] small change to trigger CI testing #13300
• [ET-VK][CI] Add vulkan CI to test exporting and running models #13295
• -> [ET-VK][examples] Create export script for Vulkan examples #13294
• [ET-VK][ez] Fix vulkan_schema interface and link Vulkan to pybindings #13327
• [ET-VK] Add optional blocklist and allowlist to vulkan partitioner to aid debugging #13326

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13294

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❌ 1 New Failure, 1 Pending

As of commit 5a2e920 with merge base 71c9a4f ():

NEW FAILURE - The following job has failed:

• Build documentation / build (buck2) / Build doc (gh)

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