Update on "[ET-VK][ez] Add ability to check for dot product extension support + upgrade glslc"

## Motivation

Prepare for shaders that will use accelerated int8 dot product GLSL extensions, i.e. `dotPacked4x8AccSatEXT`

## Changes

* Query for support for the shader integer dot product extension when creating the VkPhysicalDevice
* Request the shader integer dot product extension when creating VkDevice
* Provide APIs to check if the extension is available in the current runtime.

Differential Revision: [D81323427](https://our.internmc.facebook.com/intern/diff/D81323427/)

[ghstack-poisoned]

Author: ssjia