Task list for VK_EXT_extended_dynamic_state2

This extension allows the following states to be dynamic that will help reduce the number of pipeline objects.
* Specifying logicOp
* Specifying primitive restart enable
* Enabling/Disabling rasterization discard
* depth bias enable/disable
* Specify number of patch control points

The task list for the VK_EXT_vertex_input_dynamic_state release is:

- [x] Vulkan Specification: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VK_EXT_extended_dynamic_state2.html
- [x] Conformance tests released: https://github.com/KhronosGroup/VK-GL-CTS/releases/tag/vulkan-cts-1.2.6.1
- [x] SDK released
- [x] Validation layer: KhronosGroup/Vulkan-ValidationLayers#2724

As each component is made public, the task will be checked off. When all tasks have been completed this issue will be closed and the extension will be fully released.

Start by reviewing the VK_EXT_extended_dynamic_state2 specification link and the checked release items in the issue body. The payload does not identify a file, test, or remaining unchecked task; completion would require determining what release work, if any, is still outstanding before closing the issue.

Written by the indexing model from the issue text.