Add random descriptor set tests, and test VK_EXT_inline_uniform_block

Add random descriptor set tests, and test VK_EXT_inline_uniform_block

These tests generate random descriptor set layouts, where each descriptor
set has a random number of bindings, each binding has a random array size
and random descriptor type.

Components: Vulkan

New Tests: dEQP-VK.binding_model.descriptorset_random.*

Change-Id: I3ddfc82898ed970366ee8be4254e50e39a186c58
(cherry picked from commit 152c32af165698f43aa581c60b79bc35c1448116)