[vulkan] Added support for RPI 5

[derek-gerstmann]

The Raspberry Pi 5 only supports Vulkan v1.2, and doesn't have support for Int8, Int16, or Int64 types.

The main changes introduced in this PR are:

1. Handle arbitrary split sizes for device allocation requests
   • The RPI driver appears to require an allocation larger than the requested size which is padded to next alignment boundary
2. Refactor descriptor set updates to "push" directly, instead of allocate, update and bind (if supported).
3. Refactor tests to check for type support

Fixes #8494.

[alexreinking]

What's the status of this?

[derek-gerstmann]

The RPI Vulkan driver doesn’t seem to support any of the GLSL math functions, which don’t appear to be a requirement for conformance. We rely on them for all of the normal GPU intrinsics, so until their driver gets fixed, we’re kind of stuck unless we add support to emulate all of the math functions.