Update on "[ET-VK] 2/n Split dispatches between multiple command buffers. Add semaphore support to Adapter::submit_cmd."

This diff adds semaphore support to `Adapter::submit_cmd` by modifying its function signature to include `wait_semaphore` and `signal_semaphore` parameters. The updated function now takes into account the new semaphore parameters and correctly configures the pipeline stages using `VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT`.

Differential Revision: [D78360041](https://our.internmc.facebook.com/intern/diff/D78360041/)

[ghstack-poisoned]

Author: trivedivivek