[ET-VK][ez] Rename run_prepack() to prepack() and replace encode_prepack() + prepack() with just prepack()

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK][qlinear] Faster weight only quantized linear gemv kernel #12444
• -> [ET-VK][ez] Rename run_prepack() to prepack() and replace encode_prepack() + prepack() with just prepack() #12443
• [ET-VK] Split up prepack command buffer #12442

Title says it all!

See below diff for more context on why this new API exists.

Differential Revision: D78275583

[pytorch-bot]

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❌ 1 New Failure

As of commit 1eb0b67 with merge base dd4488d ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e274b9131f1ec03000a3c068de7232bf71b97a1afc37c7be47f86f6338b70012 /exec failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D78275583

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This pull request was exported from Phabricator. Differential Revision: D78275583