Force RDD::id to be always uint64_t

[darksylinc]

On Vulkan, some handles are meant to always be u64, even on 32-bit architectures such as arm32.

Fixes #98654

Testing methodology

Testing this is hard, because most platforms Godot is meant to be run on are already 64-bit.
Effectively this only affects arm32.

My particular worry is what if at some point Godot does the following? (or similar)

void * ptr = (void *)buffer.id; // Ooops! This is downgraded from 64 to 32 bit
buffer.id = (size_t)ptr;

More bizarre stuff such as memcpy could be happening.

To check for this very particular scenario I was afraid of, I devised a much larger patch I'm including here:

arch32_test.patch.zip

Which changes RenderingDeviceDriver::id to private and is a RenderingDeviceDriver::id[3]; where I store the value in id[1].

This way, if Godot were to make such horrible type punning (or other dangerous raw manipulation), the value would be lost even on an x64 machine.

I tested this patch, and Godot ran fine. I tested 3 different projects, but not thoroughly.

So far this change appears to be harmless. But I can never be 100% certain. Type punning Vulkan & D3D12 handles as RenderingDeviceDriver::id was not the best idea to begin with. But it is what we have.

Hopefully CI will agree.

[Repiteo]

Thanks!