[ET-VK] Add alignment fields to PackedDimInfo for padded size calculation #6324

Job	Run time
test-executorch-metal-build / macos-job	5m 13s
export-model-metal-artifact (nvidia, parakeet-tdt, non-quantized) / macos-job	8m 53s
export-model-metal-artifact (openai, whisper-large-v3-turbo, non-quantized) / macos-job	7m 28s
export-model-metal-artifact (openai, whisper-small, non-quantized) / macos-job	6m 51s
export-model-metal-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job	14m 16s
test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job	7m 12s
test-model-metal-e2e (nvidia, parakeet-tdt, non-quantized) / macos-job	4m 56s
test-model-metal-e2e (openai, whisper-small, non-quantized) / macos-job	5m 40s
test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job	5m 55s
	1h 6m 24s

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